Document:

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                                                                    Exhibit 4.8

                        AMENDMENT NO. 1 TO SECOND AMENDED
                          AND RESTATED CREDIT AGREEMENT

     THIS AMENDMENT NO. 1 TO SECOND AMENDED AND RESTATED CREDIT AGREEMENT, dated
as of December 9, 2002, (this "AMENDMENT"), among the following:

     (i) OM GROUP, INC., a Delaware corporation (herein, together with its
successors and assigns the "COMPANY" or a "BORROWER");

     (ii) OMG AG & CO. KG, a partnership organized under the laws of the federal
Republic of Germany (herein, together with its successors and assigns, "OMG AG"
or a "BORROWER");

     (iii) the Lenders party hereto; and

     (iv) NATIONAL CITY BANK, as the administrative agent (in such capacity, the
"ADMINISTRATIVE AGENT"), and the collateral agent (in such capacity, the
"COLLATERAL AGENT") for the Lenders.

                             PRELIMINARY STATEMENTS:

     (1) The Company, OMG AG, the Lenders named therein, the Administrative
Agent, the Collateral Agent and the other parties thereto entered into the
Second Amended and Restated Credit Agreement, dated as of June 28, 2002 (the
"CREDIT AGREEMENT"; with the terms defined therein being used herein as so
defined).

     (2) The parties hereto desire to amend certain terms of the Credit
Agreement, as more fully set forth below.

     NOW, THEREFORE, the parties hereby agree as follows:

SECTION 1. AMENDMENT TO DEFINITIONS.

          1.1 AMENDMENT TO DEFINITIONS. Effective on the Amendment Effective
Date provided for in section 5 hereof, the following definitions in section 1.1
of the Credit Agreement are hereby amended and restated in their entirety to
read as follows:

     "COMMITMENT" shall mean, with respect to any Lender, the aggregate of its
     Term C Commitment, if any, its Incremental Term Loan Commitment, if any,
     its Revolving Commitment, if any, and its Swing Line Commitment, if any.

     "CONSOLIDATED EBITDA" shall mean, for any period, Consolidated Net Income
     for such period; PLUS (A) the sum of the amounts for such period included
     in determining such Consolidated Net Income of (i) Consolidated Interest
     Expense, (ii) Consolidated Income Tax Expense, (iii) Consolidated
     Depreciation Expense, (iv) Consolidated Amortization Expense, (v) non-cash
     losses and charges which are properly classified as extraordinary or
     non-recurring (including, without limitation, non-recurring fees, expenses
     and costs relating to the Transaction), and

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     (vi) non-cash charges associated with FAS 142 and FAS 144 and restructuring
     charges taken for the fiscal quarters of the Company ending December 31,
     2002 and March 31, 2003 up to a maximum aggregate amount of $335,000,000
     (provided that the cash component of such restructuring charges paid by the
     Company and its Subsidiaries, whether paid in the fiscal quarter ending
     December 31, 2002 or thereafter, shall not exceed $43,000,000); LESS (B)
     gains on sales of assets and other extraordinary gains and other
     non-recurring non-cash gains, EXCEPT that in computing Consolidated Net
     Income for purposes of this definition, there shall be excluded therefrom
     (x) the income (or loss) of any entity (other than Subsidiaries of the
     Company) in which the Company or any of its Subsidiaries has a joint or
     minority interest, except to the extent of the amount of dividends or other
     distributions actually paid to the Company or any of its Subsidiaries
     during such period, and (y) the income of any Subsidiary of the Company to
     the extent that the declaration or payment of dividends or similar
     distributions by that Subsidiary of that income is not at the time
     permitted by operation of the terms of its charter or any agreement,
     instrument, judgment, decree, order, statute, rule or governmental
     regulation applicable to that Subsidiary.

     "CONSOLIDATED NET WORTH" shall mean at any time for the determination
     thereof all amounts which, in conformity with GAAP, would be included under
     the caption "total stockholders' equity" (or any like caption) on a
     consolidated balance sheet of the Company as at such date, PLUS non-cash
     charges associated with FAS 142 and FAS 144 and restructuring charges taken
     for the fiscal quarters of the Company ending December 31, 2002 and March
     31, 2003, up to a maximum aggregate amount of $335,000,000 (provided that
     the cash component of such restructuring charges paid by the Company and it
     Subsidiaries, whether paid in the fiscal quarter ending December 31, 2002
     or thereafter, shall not exceed $43,000,000) PROVIDED that in no event
     shall Consolidated Net Worth include any amounts in respect of Redeemable
     Stock.

     "CREDIT DOCUMENTS" shall mean this Agreement, the Notes, the Subsidiary
     Guaranty, the Security Documents, any Letter of Credit Document, any
     Incremental Term Loan Assumption Agreement, any Additional Security
     Document and any other security agreement, pledge agreement, guaranty
     agreement or other agreement executed in connection with the Existing
     Credit Agreement or this Agreement and each other agreement, certificate,
     document or instrument delivered in connection with any Credit Document,
     whether or not specifically mentioned therein or herein.

     "EUROCURRENCY RATE" shall mean with respect to each Interest Period for a
     Eurocurrency Loan, the greater of (1) 1.75% per annum or (2) the rate
     determined by the following methods: (A) either (i) the rate per annum for
     deposits in Dollars or in Euros for a maturity most nearly comparable to
     such Interest Period which appears on page 3740 or 3750, as applicable, of
     the Dow Jones Telerate Screen as of 11:00 A.M. (local time at the Notice
     Office) on the date which is two Business Days prior to the commencement of
     such Interest Period, or (ii) if such a rate does not appear on such a
     page, an interest rate per annum equal to the average (rounded to the
     nearest ten thousandth of 1% per annum, if such average

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     is not such a multiple) of the rate per annum at which deposits in Dollars
     or in Euros are offered to each of the Reference Banks by prime banks in
     the London interbank Eurocurrency market for deposits of amounts in same
     day funds comparable to the outstanding principal amount of the
     Eurocurrency Loan for which an interest rate is then being determined with
     maturities comparable to the Interest Period to be applicable to such
     Eurocurrency Loan, determined as of 11:00 A.M. (London time) on the date
     which is two Business Days prior to the commencement of such Interest
     Period, in each case divided (and rounded to the nearest ten thousandth of
     1%) by (B) a percentage equal to 100% minus the then stated maximum rate of
     all reserve requirements (including, without limitation, any marginal,
     emergency, supplemental, special or other reserves) applicable to any
     member bank of the Federal Reserve System in respect of Eurocurrency
     liabilities as defined in Regulation D (or any successor category of
     liabilities under Regulation D); PROVIDED, HOWEVER, that in the event that
     the rate referred to in clause (i) above is not available at any such time
     for any reason, then the rate referred to in clause (i) shall instead be
     the average (rounded to the nearest ten thousandth of 1%) of the rates at
     which U.S. dollar deposits of $5,000,000 are offered to the Reference Banks
     in the London interbank market at approximately 11:00 a.m. (London time),
     two Business Days prior to the commencement of such Interest Period, for
     contracts which would be entered into at the commencement of such Interest
     Period.

     "INCREMENTAL TERM LOAN MATURITY DATE" shall mean April 1, 2006, or such
     earlier date on which the Incremental Term Loan Commitment is terminated.

     "INCREMENTAL TERM LOAN REPAYMENT DATE" shall mean each April 1, July 1,
     October 1 or January 1, beginning on April 1, 2003, and ending on the
     Incremental Term Loan Maturity Date.

     "PERMITTED ACQUISITIONS" [Intentionally omitted]

     "TERM C MATURITY DATE" shall mean April 1, 2006, or such earlier date on
     which the Total Term C Commitment is terminated.

          1.2 ADDITIONAL DEFINED TERMS. Effective on the Amendment Effective
Date, section 1.1 of the Credit Agreement is hereby amended by adding the
following defined terms in appropriate alphabetical order:

     "ADDITIONAL SUBSIDIARY GUARANTORS" shall have the meaning provided in
     Amendment No. 1.

     "AMENDMENT NO. 1" shall mean Amendment No. 1 to Second Amended and Restated
     Credit Agreement, dated as of December 9, 2002, among the Borrowers, the
     Administrative Agent, the Collateral Agent and the Lenders party thereto.

     "AMENDMENT EFFECTIVE DATE" shall have the meaning provided in Amendment No.
     1.

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     "CONSOLIDATED TOTAL SENIOR DEBT" shall mean the sum (without duplication)
     of all Indebtedness (other than Indebtedness described in clause (x) of the
     definition thereof) of the Company and each of its Subsidiaries other than
     (i) Subordinated Indebtedness and (ii) Indebtedness incurred pursuant to
     section 9.4(g), all as determined on a consolidated basis, PLUS all
     obligations of the Receivables Subsidiary under the Permitted Receivables
     Program.

     "INCREMENTAL TERM NOTE" shall have the meaning provided in Amendment No. 1.

     "LIQUIDITY RESERVE" shall mean $50,000,000.

     "NEW SECURITY AGREEMENT" shall have the meaning provided in Amendment
     No. 1.

SECTION 2. AMENDMENT TO COMMITMENTS AND REPAYMENTS.

          2.1 DECREASE IN REVOLVING COMMITMENTS; ESTABLISHMENT OF INCREMENTAL
TERM LOAN COMMITMENTS. Effective on the Amendment Effective Date, Annex I to the
Credit Agreement is hereby amended and restated in its entirety as set forth in
Annex I hereto. On the Amendment Effective Date, each Lender with an Incremental
Term Loan Commitment will make an Incremental Term Loan to the Company in an
amount equal to its Incremental Term Loan Commitment by converting an equal
principal amount of its outstanding Revolving Loans into Incremental Term Loans,
and the Revolving Commitment shall be permanently reduced by an equal amount.
The Company will execute and deliver to each Incremental Term Lender on the
Amendment Effective Date a promissory note (each, an "INCREMENTAL TERM NOTE")
evidencing such Lender's Incremental Term Loans to the Company and maturing on
the Incremental Term Loan Maturity Date. The Incremental Term Loans shall be
repayable in equal quarterly installments of $250,000 on each Incremental Term
Loan Repayment Date, with a final payment on the Incremental Term Loan Maturity
Date in an amount equal to the remaining principal amount of Incremental Term
Loans then outstanding. The Administrative Agent and each Incremental Term Loan
Lender agrees that this Amendment shall evidence an "INCREMENTAL TERM LOAN
ASSUMPTION AGREEMENT" as defined in the Credit Agreement.

          2.2 REVOLVING FACILITY CHANGES. Effective on the Amendment Effective
Date, section 2.1(b) of the Credit Agreement is hereby amended and restated in
its entirety as follows:

     (b) REVOLVING FACILITY. Prior to the Closing Date, Existing Lenders have
     made loans to the Company which are outstanding as "Revolving Loans"
     pursuant to the Existing Credit Agreement. Thereafter, all Loans under the
     Revolving Facility (each a "REVOLVING LOAN" and, collectively, the
     "REVOLVING LOANS"): (i) may be incurred by any Borrower, at any time and
     from time to time on and after the Closing Date and prior to the date the
     Total Revolving Commitment expires or is terminated; (ii) except as
     otherwise provided, may, at the option of the applicable Borrower be
     incurred and maintained, as, or Converted into, Revolving Loans which are
     Prime Rate Loans or Eurocurrency Loans, in each case denominated in Dollars
     or Euros, PROVIDED that all Revolving Loans made as part of the same
     Revolving Borrowing shall, unless otherwise specifically

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     provided herein, consist of Revolving Loans of the same Type and currency,
     and provided, further, that Foreign Borrowers may borrow Revolving Loans
     denominated only in Euros, and provided, further, the aggregate principal
     amount of Revolving Loans denominated in Euros shall not exceed at any time
     outstanding the Alternative Currency Sublimit; (iii) may be repaid or
     prepaid and reborrowed in accordance with the provisions hereof; (iv) may
     only be made if after giving effect thereto the Unutilized Total Revolving
     Commitment exceeds the outstanding Swing Line Loans; and (v) shall not
     exceed for any Lender at any time outstanding that aggregate principal
     amount which, when added to the sum of (i) such Lender's Swing Line
     Exposure PLUS (2) the product at such time of (A) such Lender's Revolving
     Facility Percentage, TIMES (B) the aggregate Letter of Credit Outstandings,
     equals the Revolving Commitment of such Lender at such time, PROVIDED THAT
     the Unutilized Total Revolving Commitment may not at any time be less than
     the Liquidity Reserve without the consent of each of (x) Non-Defaulting
     Lenders whose outstanding Revolving Loans and Unutilized Revolving
     Commitments constitute at least 66-2/3% of the sum of the total outstanding
     Revolving Loans and the Unutilized Revolving Commitments of Non-Defaulting
     Lenders, (y) Non-Defaulting Lenders whose outstanding Term C Loans
     constitute at least 66-2/3% of the sum of the total outstanding Term C
     Loans of Non-Defaulting Lenders and (z) Non-Defaulting Lenders whose
     outstanding Incremental Term Loans constitute at least 66-2/3% of the sum
     of the total outstanding Incremental Term Loans of Non-Defaulting Lenders.

          2.3 INCREMENTAL TERM LOANS. Effective on the Amendment Effective Date,
section 2.1(f)(i) of the Credit Agreement is hereby amended by amending and
restating the second and third sentences thereof in their entirety as follows:

     Such notice shall set forth (i) the amount of the Incremental Term Loan
     Commitments being requested (which shall be in minimum increments of
     $5,000,000 and a minimum amount of $10,000,000 or equal to the remaining
     Incremental Term Loan Amount), (ii) the date on which such Incremental Term
     Loan Commitments are requested to become effective, (iii) whether such
     Incremental Term Loan Commitments are to be Term C Commitments or
     commitments to make Term Loans with terms different from the Term C Loans
     ("OTHER TERM LOANS"), and (iv) whether such Incremental Term Loan
     Commitments may be funded by converting the outstanding principal amount of
     any outstanding Loans into Other Term Loans. In the event that any Lender's
     Commitment would be increased thereby, such Lender may in its sole
     discretion agree or decline to provide Incremental Term Loan Commitments.

          2.4 PRICING CHANGES. Effective on the Amendment Effective Date,
section 2.7(g) of the Credit Agreement is hereby amended and restated in its
entirety as follows:

     (g) INTEREST RATE MARGINS. As used herein the terms "APPLICABLE PRIME RATE
     MARGIN" and "APPLICABLE EUROCURRENCY MARGIN" shall mean the applicable
     rates determined in accordance with the following provisions. From and
     after the Amendment Effective Date through June 30, 2003, (i) the
     Applicable Prime Rate Margin for Term C Loans and Incremental Term Loans
     will be 400 basis points

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     per annum, and the Applicable Eurocurrency Margin for Term C Loans and
     Incremental Term Loans will be 500 basis points per annum and (ii) the
     Applicable Prime Rate Margin for Revolving Loans and Swing Line Loans will
     be 400 basis points per annum, and the Applicable Eurocurrency Margin for
     Revolving Loans will be 500 basis points per annum. On March 31, 2003, the
     Applicable Prime Rate Margin for all Loans and the Applicable Eurocurrency
     Margin for all Loans will in each case increase by 25 basis points per
     annum if by such date the Company has not delivered fully executed letters
     of intent with respect to proposed Asset Sales which would result in Net
     Cash Proceeds to the Company of at least $350,000,000. On July 1, 2003, the
     Applicable Prime Rate Margin for all Loans and the Applicable Eurocurrency
     Margin for all Loans will in each case increase by 50 basis points per
     annum, and on the first day of each fiscal quarter of the Company
     thereafter beginning on October 1, 2003, the Applicable Prime Rate Margin
     for all Loans and the Applicable Eurocurrency Margin for all Loans will in
     each case increase by an additional 25 basis points per annum, up to
     maximum Applicable Prime Rate Margin of 500 basis points per annum and a
     maximum Applicable Eurocurrency Margin of 600 basis points per annum;
     PROVIDED, HOWEVER, that notwithstanding any of the foregoing to the
     contrary, the Applicable Prime Rate Margin for all Loans will be 350 basis
     points per annum and the Applicable Eurocurrency Margin for all Loans will
     be 450 basis points per annum on and after the date the Company has
     received Net Cash Proceeds from Asset Sales (cumulative from and after the
     Amendment Effective Date) of at least $425,000,000 and such Net Cash
     Proceeds have been applied to a prepayment of the Loans, allocated pursuant
     to the provisions of section 5.2(g), but only if after giving effect to
     such Asset Sales and such repayment the Company would be compliance with
     each of the financial covenants contained in sections 9.7, 9.8, 9.9 and
     9.10, inclusive, on a pro forma basis after giving effect thereto. The
     Applicable Commitment Fee Rate for Revolving Loans will be 50 basis points
     per annum at all times from and after the Amendment Effective Date.

          2.5 LETTER OF CREDIT SUBLIMIT. Effective on the Amendment Effective
Date, section 3.1(b) of the Credit Agreement is hereby amended by deleting the
reference to "$50,000,000" in clause (i)(x) thereof and replacing it with
"$10,000,000".

SECTION 3. AMENDMENTS TO COVENANTS AND OTHER PROVISIONS.

          3.1 REPORTING REQUIREMENTS; MONTHLY REPORTS. Effective on the
Amendment Effective Date, section 8.1(b) of the Credit Agreement is hereby
amended by inserting "(i)" immediately after "(b)" and before the title
"QUARTERLY FINANCIAL STATEMENTS" and by adding an additional subsection (ii) as
follows:

     (ii) MONTHLY FINANCIAL STATEMENTS. (A) As soon as available and in any
     event within 30 days after the close of each of the first two monthly
     accounting periods in each fiscal quarter of the Company, the unaudited
     consolidated balance sheets of the Company and its consolidated
     Subsidiaries as at the end of such monthly period and the related unaudited
     consolidated statements of income of cash flows and retained earnings for
     such monthly period and/or for the fiscal year to date, and (B) within 30
     days after the close of each of the monthly

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     accounting periods in each fiscal quarter of the Company: (1) a schedule of
     all outstanding metal leases, detailing the maturity or expiration date of
     each such metal lease and whether any lessor under such metal leases has
     provided notice, written or otherwise, to the Company or any of its
     Subsidiaries that it does not intend to renew or extend any metal lease at
     the expiration of the current term and (2) a description of Asset Sales
     completed and the individual and cumulative Net Cash Proceeds therefrom,
     all in form and substance satisfactory to the Joint Lead Arrangers, and all
     of which shall be certified on behalf of the Company by the Chief Financial
     Officer or other Authorized Officer of the Company, subject to changes
     resulting from normal year-end audit adjustments; PROVIDED, HOWEVER that no
     Lender that is precluded from receiving any material non-public information
     in respect of the Company pursuant to paragraph (b)(1) of the Regulation FD
     under the Securities Act of 1933, as amended, shall be entitled to receive
     such monthly financial statements, and any Lender accepting such monthly
     financial statements shall be deemed to represent and warrant to the
     Company and the Administrative Agent, by such acceptance, that it is not
     precluded from receiving any material non-public information in respect of
     the Company pursuant to paragraph (b)(1) of Regulation FD under the
     Securities Act of 1933, as amended.

          3.2 13-WEEK FORECASTS. Effective on the Amendment Effective Date,
section 8.1(d) of the Credit Agreement is hereby amended and restated in its
entirety as follows:

     (d) BUDGETS AND FORECASTS; 13-WEEK FORECASTS.

     (i) BUDGETS AND FORECASTS. Not later than 60 days following the
     commencement of any fiscal year of the Company and its Subsidiaries, a
     consolidated budget in reasonable detail for each of the four fiscal
     quarters of such fiscal year, as customarily prepared by management for its
     internal use, setting forth the forecasted balance sheet, income statement,
     operating cash flows and capital expenditures of the Company and its
     Subsidiaries for the period covered thereby.

     (ii) 13-WEEK FORECASTS. Not later than 5:00 p.m. on the first Business Day
     of each second week, beginning on December 16, 2002, the Company's and its
     Subsidiaries' forecast of cash receipts and disbursements for the ensuing
     13-week period; PROVIDED, HOWEVER, that no Lender that is precluded from
     receiving any material non-public information in respect of the Company
     pursuant to paragraph (b)(1) of the Regulation FD under the Securities Act
     of 1933, as amended, shall be entitled to receive such monthly financial
     statements, and any Lender accepting such monthly financial statements
     shall be deemed to represent and warrant to the Company and the
     Administrative Agent, by such acceptance, that it is not precluded from
     receiving any material non-public information in respect of the Company
     pursuant to paragraph (b)(1) of Regulation FD under the Securities Act of
     1933, as amended.

          3.3 Effective on the Amendment Date, a new subsection (m) is added to
section 5.2 of the Credit Agreement as follows:

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     (m) RIGHT OF TERM C LENDERS TO FOREGO CERTAIN MANDATORY PREPAYMENTS. Unless
at such time (after giving effect to any other contemporaneous payments) there
are no Incremental Term Loans outstanding, each Term C Lender shall have the
right to forego the application to its Term C Loans of any mandatory prepayment
of its Term C Loans required to be made pursuant to section 5.2(g) hereof (any
such proposed mandatory prepayment, a "PROPOSED REJECTABLE PREPAYMENT"), in
accordance with the following provisions:

          (i) The Administrative Agent shall, on or prior to 3:00 P.M. (local
     time at the Notice Office) on the date it receives immediately available
     funds from the Borrower in respect of a prepayment of Loans which is in
     whole or in part a Proposed Rejectable Prepayment, give each Term C Lender
     written or telephonic notice of (A) the amount of such prepayment and (B)
     such Term C Lender's right to forego the application to its Term C Loans of
     its ratable portion of such prepayment, which notice shall request such
     Term C Lender to confirm to the Administrative Agent whether or not it
     wishes to forego such application to its Term C Loans.

          (ii) If any Term C Lender so indicates its desire to forego such
     application to the prepayment of its Term C Loans by giving the
     Administrative Agent written or telephone notice to such effect by 5:00
     P.M. (local time at the Notice Office) no later than the third Business Day
     after the date such Term C Lender receives such written or telephone notice
     from the Administrative Agent, the amount of the applicable prepayment
     which otherwise would have been applied to its Term C Loans shall,
     notwithstanding anything to the contrary contained in this section 5.2, be
     applied instead to the prepayment of other Term Loans, and after no Term
     Loans are outstanding, to the prepayment of the Revolving Loans, all such
     prepayments to be made in accordance with any other applicable provisions
     of this section 5.2.

          (iii) The Administrative Agent may act without liability upon the
     basis of any such telephone notice or written notice believed by the
     Administrative Agent in good faith to be from an authorized representative
     of a Term C Lender. In the case of each such telephone notice, the
     Administrative Agent's record of the terms of such telephonic notice shall
     be conclusive absent manifest error.

          (iv) Any Term C Lender which does not respond to the Administrative
     Agent within the time period specified above to a notice from the
     Administrative Agent requesting it to confirm whether or not its wishes to
     exercise its right to forego the application of its portion of such
     prepayment to its Term C Loans pursuant to this section 5.2(m) shall be
     deemed to have waived such right to forego such application.

          (v) Notwithstanding anything to the contrary contained in this
     Agreement, the Administrative Agent may defer, until the next Business Day,
     the distribution to the Lenders of any portion of any prepayment of Loans
     received by the Administrative Agent pursuant to section 5.2(g), as to
     which the Administrative Agent is determining whether or not the Term C
     Lenders wish to exercise their rights under this section 5.2(m).

          3.4 ASSET SALE REQUIREMENT. Effective on the Amendment Effective Date,
a new section 8.17 is hereby added to the Credit Agreement as follows:

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     8.17 ASSET SALES/EQUITY PROCEEDS. After the Amendment Effective Date and on
     or by the dates as provided below, the Company shall (i) sell or cause its
     Subsidiaries to sell, property, land, buildings, the entire capital stock
     of any Subsidiary or otherwise dispose of assets or (ii) issue equity
     securities (other than Redeemable Stock), generating (A) on or by June 30,
     2003, cumulative gross proceeds to the Company of such Asset Sales and
     equity issuances of at least $75,000,000 (less reasonable fees, expenses
     and taxes paid to non-Affiliates) and (B) on or by December 31, 2003,
     cumulative Net Cash Proceeds to the Company from such Asset Sales and
     equity issuances of at least $425,000,000. The Net Cash Proceeds generated
     from such Asset Sales or equity issuances shall be applied to a prepayment
     of the Loans, allocated in accordance with the provisions of section 5.2,
     and to the installments thereof in inverse order.

          3.5 CONSOLIDATION, MERGER, ACQUISITIONS, ASSET SALES. Effective on the
Amendment Effective Date, sections 9.2(a), 9.2(c), 9.2(d) and 9.2(g) of the
Credit Agreement are hereby each amended and restated in its entirety to read as
follows:

     (a) CERTAIN INTERCOMPANY MERGERS, ETC. If no Default or Event of Default
     shall have occurred and be continuing or would result therefrom,

          (i) the merger, consolidation or amalgamation of any Subsidiary (other
     than any Subsidiary party to the New Security Agreement) of the Company
     with or into the Company, PROVIDED the Company is the surviving or
     continuing or resulting corporation;

          (ii) the merger, consolidation or amalgamation of any Domestic
     Subsidiary of the Company (other than any Domestic Subsidiary party to the
     New Security Agreement) with or into another Domestic Subsidiary of the
     Company, PROVIDED that the surviving or continuing or resulting corporation
     is a Domestic Subsidiary of the Company which is a Subsidiary Guarantor and
     a Wholly-Owned Subsidiary of the Company;

          (iii) the merger, consolidation or amalgamation of any Foreign
     Subsidiary of the Company (other than any which is a Borrower hereunder or
     any which is a party to the New Security Agreement) with or into another
     Foreign Subsidiary of the Company, PROVIDED that the surviving or
     continuing or resulting corporation is a Wholly-Owned Subsidiary of the
     Company;

          (iv) the liquidation, winding up or dissolution of (x) any
     Wholly-Owned Subsidiary of the Company (other than any Subsidiary party to
     the New Security Agreement); or (y) any other Subsidiary of the Company in
     an Asset Sale permitted under section 9.2(d); and

          (v) the transfer or other disposition of any property by the Company
     to any Wholly-Owned Subsidiary or by any Subsidiary (other than any
     Subsidiary party to the New Security Agreement) to the Company or any other
     Wholly-Owned Subsidiary of the Company, regardless of whether such
     intercompany transaction

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     would constitute an Asset Sale of the Company, regardless of whether such
     intercompany transaction would constitute an Asset Sale.

     (c) ACQUISITIONS. [Intentionally omitted].

     (d) PERMITTED DISPOSITIONS. If no Default or Event of Default shall have
     occurred and be continuing or would result therefrom, from the Amendment
     Effective Date through and including December 31, 2003, the Company or any
     of its Subsidiaries may (i) sell any property, land or building (including
     any related receivables or other intangible assets) to any Person which is
     not a Subsidiary of the Company, or (ii) sell the entire capital stock (or
     other equity interests) and Indebtedness of any Subsidiary owned by the
     Company or any other Subsidiary to any Person which is not a Subsidiary of
     the Company, or (iii) permit any Subsidiary to be merged or consolidated
     with a Person which is not an Affiliate of the Company, or (iv) consummate
     any other Asset Sale with a Person who is not a Subsidiary of the Company;
     PROVIDED that:

               (A) the consideration for such transaction represents fair value
          (as determined by management of the Company), and at least 80% of such
          consideration consists of cash;

               (B) without the written consent of the Required Lenders, the
          cumulative aggregate consideration for all such transactions completed
          during such time period does not exceed $150,000,000;

               (C) in the case of any such transaction involving consideration
          in excess of $25,000,000, at least five Business Days prior to the
          date of completion of such transaction the Company shall have
          delivered to the Administrative Agent an officer's certificate
          executed on behalf of the Company by an Authorized Officer of the
          Company, which certificate shall (1) contain a description of the
          proposed transaction, the date such transaction is scheduled to be
          consummated, the estimated purchase price or other consideration for
          such transaction, (2) contain a certification that no Default or Event
          of Default has occurred and is continuing, or would result from
          consummation of such transaction, together with a demonstration (x)
          that the Company would be in compliance with each of the financial
          covenants contained in sections 9.7, 9.8, 9.9 and 9.10, inclusive, on
          a pro forma basis after giving effect to such disposition and (y) the
          ratio of Consolidated Total Senior Debt to Consolidated EBITDA, on a
          pro forma basis after giving effect to such disposition, would not be
          greater than such ratio prior to such disposition, and (3) include a
          certified copy of the draft or definitive documentation pertaining
          thereto; and

               (D) contemporaneously with the completion of such transaction the
          Company applies the proceeds therefrom to a prepayment of the Loans,
          allocated in accordance with section 5.2 hereof.

                                       10

<PAGE>

          (g) CAPITAL EXPENDITURES. The Company and its Subsidiaries shall be
          permitted to make Consolidated Capital Expenditures up to the maximum
          amounts for the periods set forth below:

         ======================================================================
         FISCAL PERIOD ENDING                               MAXIMUM CAPITAL
                                                             EXPENDITURES
         ======================================================================
         December 31, 2002                                   $18,500,000
         ----------------------------------------------------------------------
         March 31, 2003                                      $22,500,000
         ----------------------------------------------------------------------
         June 30, 2003                                       $20,000,000
         ----------------------------------------------------------------------
         September 30, 2003                                  $16,000,000
         ----------------------------------------------------------------------
         December 31, 2003                                   $14,000,000
         ----------------------------------------------------------------------
         Fiscal Year 2003 (cumulative)                       $65,000,000
         ----------------------------------------------------------------------
         Fiscal Year 2004 and each Fiscal Year thereafter    $60,000,000
         ======================================================================

PROVIDED, HOWEVER, that to the extent the Company and its Subsidiaries do not
make the maximum amount of permitted Consolidated Capital Expenditures in any
fiscal quarter above, any unused amounts may be expended in any subsequent
fiscal quarter, up to the maximum permitted amount for the relevant Fiscal Year.

          3.6 ADVANCES, INVESTMENTS, LOANS AND GUARANTY OBLIGATIONS. Effective
on the Amendment Effective Date, section 9.5(a) is hereby amended and restated
in its entirety to read as follows: "(a) the Company or any of its Subsidiaries
may invest in cash and Cash Equivalents; PROVIDED, HOWEVER, that if as of the
end of any fiscal month of the Company, the aggregate balance of cash and Cash
Equivalents of the Company and its Subsidiaries exceeds $50,000,000, then the
Company shall apply any such excess to the Revolving Loans;" and section 9.5(o)
is hereby amended by deleting the reference to "$50,000,000" in the last line
therein and replacing it with "$40,000,000".

          3.7 DIVIDENDS AND OTHER RESTRICTED PAYMENTS. Effective on the
Amendment Effective Date, sections 9.6(d) and 9.6(e) of the Credit Agreement are
hereby amended and restated in their entirety as follows:

     (d) [INTENTIONALLY OMITTED.]

     (e) [INTENTIONALLY OMITTED.]

          3.8 FINANCIAL COVENANTS. (a) Effective on the Amendment Effective
Date, section 9.7 of the Credit Agreement is hereby amended and restated in its
entirety as follows:

     9.7 (a) CONSOLIDATED TOTAL DEBT/CONSOLIDATED EBITDA RATIO. The Company will
     not on the last day of any Testing Period indicated below permit the ratio
     of (i) the amount of its Consolidated Total Debt at such time to (ii) its
     Consolidated EBITDA for its Testing Period most recently ended, to exceed
     the ratio specified below for such Testing Period:

                                       11

<PAGE>

         ======================================================================
                     TESTING PERIOD                            RATIO
         ======================================================================
         Testing Period ended December 31, 2002            5.50 to 1.00
         ----------------------------------------------------------------------
         Testing Period ended March 31, 2003               6.00 to 1.00
         ----------------------------------------------------------------------
         Testing Period ended June 30, 2003                6.50 to 1.00
         ----------------------------------------------------------------------
         Testing Period ended September 30, 2003           6.50 to 1.00
         ----------------------------------------------------------------------
         Testing Period ended December 31, 2003            6.00 to 1.00
         ----------------------------------------------------------------------
         Any Testing Period thereafter                     3.25 to 1.00
         ======================================================================

          (b) CONSOLIDATED TOTAL SENIOR DEBT/CONSOLIDATED EBITDA RATIO. The
Company will not on the last day of any Testing Period indicated below permit
the ratio of (i) the amount of its Consolidated Total Senior Debt at such time
to (ii) its Consolidated EBITDA for its Testing Period most recently ended, to
exceed the ratio specified below for such Testing Period:

         ======================================================================
                     TESTING PERIOD                             RATIO
         ======================================================================
         Testing Period ended December 31, 2002            3.75 to 1.00
         ----------------------------------------------------------------------
         Testing Period ended March 31, 2003               4.00 to 1.00
         ----------------------------------------------------------------------
         Testing Period ended June 30, 2003                4.25 to 1.00
         ----------------------------------------------------------------------
         Testing Period ended September 30, 2003           4.25 to 1.00
         ----------------------------------------------------------------------
         Testing Period ended December 31, 2003            2.25 to 1.00
         ----------------------------------------------------------------------
         Any Testing Period thereafter                     2.00 to 1.00
         ======================================================================

     (b) Effective on the Amendment Effective Date, section 9.8 of the Credit
Agreement is hereby amended and restated in its entirety as follows:

     9.8 CONSOLIDATED TOTAL DEBT/CONSOLIDATED TOTAL CAPITALIZATION RATIO. The
     Company will not on the last day of any fiscal quarter indicated below
     permit the ratio, expressed as a percentage, of (i) the amount of its
     Consolidated Total Debt at such time to (ii) its Consolidated Total
     Capital, to exceed the ratio specified below:

         ===================================================================
                      PERIOD                               RATIO
         ===================================================================
         December 31, 2002, March 31, 2003,
         June 30, 2003, September 30,                       65%
         2003, December 31, 2003
         -------------------------------------------------------------------
         Any fiscal quarter thereafter                      55%
         ===================================================================

     (c) Effective on the Amendment Effective Date, section 9.10 of the Credit
Agreement is hereby amended and restated in its entirety as follows:

                                       12

<PAGE>

     9.10 INTEREST COVERAGE RATIO. The Company will not permit its Interest
     Coverage Ratio for any Testing Period to be less than the ratio specified
     below:

     ========================================================================
               TESTING PERIOD                               RATIO
     ========================================================================
     Testing Period ended December 31, 2002              3.00 to 1.00
     ------------------------------------------------------------------------
     Testing Period ended March 31, 2003                 2.60 to 1.00
     ------------------------------------------------------------------------
     Testing Period ended June 30, 2003                  2.25 to 1.00
     ------------------------------------------------------------------------
     Testing Period ended September 30, 2003             2.10 to 1.00
     ------------------------------------------------------------------------
     Testing Period ended December 31, 2003              2.40 to 1.00
     ------------------------------------------------------------------------
     Any Testing Period thereafter                       3.50 to 1.00
     ========================================================================

          3.9 Effective on the Amendment Effective Date, section 13.8(a) of the
Credit Agreement is hereby amended and restated in its entirety to read as
follows:

     (a) THIS AGREEMENT AND THE OTHER CREDIT DOCUMENTS AND THE RIGHTS AND
     OBLIGATIONS OF THE PARTIES HEREUNDER AND THEREUNDER WILL EACH BE DEEMED TO
     BE A CONTRACT MADE UNDER AND GOVERNED BY THE INTERNAL LAWS OF THE STATE OF
     NEW YORK (INCLUDING FOR SUCH PURPOSE SECTIONS 5-1401 AND 5-1402 OF THE
     GENERAL OBLIGATIONS LAW OF THE STATE OF NEW YORK) TO THE FULLEST EXTENT
     PERMITTED BY LAW. EACH BORROWER HEREBY UNCONDITIONALLY AND IRREVOCABLY
     WAIVES ANY CLAIM TO ASSERT THAT THE LAW OF ANY JURISDICTION OTHER THAN THE
     STATE OF NEW YORK GOVERNS THIS AGREEMENT OR ANY OF THE OTHER CREDIT
     DOCUMENTS. Any legal action or proceeding with respect to this Agreement or
     any other Credit Document may be brought in the Courts of the State of New
     York or of the United States for the Southern District of New York, located
     in New York County, New York, and, by execution and delivery of this
     Agreement, each Borrower hereby irrevocably accepts for itself and in
     respect of its property, generally and unconditionally, the jurisdiction of
     the aforesaid courts. Each Borrower hereby further irrevocably consents to
     the service of process out of any of the aforementioned courts in any such
     action or proceeding by the mailing of copies thereof by registered or
     certified mail, postage prepaid, to the Borrowers at their addresses for
     notices pursuant to section 13.3, such service to become effective 30 days
     after such mailing or at such earlier time as may be provided under
     applicable law. Nothing herein shall affect the right of the Administrative
     Agent or any Lender to serve process in any other manner permitted by law
     or to commence legal proceedings or otherwise proceed against the Borrowers
     in any other jurisdiction.

SECTION 4. ADDITIONAL COVENANTS AND AGREEMENTS.

          4.1 ADDITIONAL PAYMENT. If as of the end of the Fiscal Year of the
Company ending on December 31, 2002 or December 31, 2003, the Company's ratio of
Consolidated Total

                                       13
<PAGE>

Debt to Consolidated EBITDA for and as of the end of such Fiscal Year exceeds
2.00 to 1.00, the Company shall, on or before the date on which the Company is
required to deliver the financial statements pursuant to section 8.1(a), in
addition to any payments required to be made pursuant to section 5.2(f) of the
Credit Agreement, make an additional payment of the Term Loans in an amount
equal to 25% of Excess Cash Flow for such Fiscal Year. Such payment shall be
allocated among the Term C Loans and the Incremental Term Loans PRO RATA, and
applied to the Scheduled Repayments and Incremental Term Loan installments
thereof in inverse order of their maturity.

          4.2 ADDITIONAL SECURITY. Notwithstanding anything contained in
sections 8.11 or 8.12 of the Credit Agreement or elsewhere, in partial
consideration for the amendments and concessions provided in this Amendment, the
Company agrees that on or before January 2, 2003, the Company shall cause each
of OMG Bellville, Ltd., OMG Catalyst Canada, 1354950 Ontario Inc. and OMG UK
Ltd. (collectively, the "ADDITIONAL SUBSIDIARY GUARANTORS") to (i) deliver to
the Administrative Agent a Subsidiary Guaranty in form and substance
satisfactory to the Joint Lead Arrangers and (ii) grant to the Collateral Agent
for the benefit of the Secured Creditors (as defined in the Security Documents)
a valid and enforceable first priority perfected security interest, superior to
and prior to the rights of all third persons and subject to no other Lien, other
than Permitted Liens and other Liens as may be acceptable to the Administrative
Agent, in all real and personal tangible and intangible property of each of the
Additional Subsidiary Guarantors (except to the extent not required by the
Administrative Agent), such security interest to be granted pursuant to
Additional Security Documents satisfactory in form and substance to the
Administrative Agent, together with authorizing resolutions of the Board of
Directors (or the equivalent) of each of them, certified by the Secretary of
each such Person as duly adopted and in full force and effect, authorizing the
execution and delivery of such Subsidiary Guaranty and the Additional Security
Documents, together with such opinions of counsel as may be reasonably requested
by the Administrative Agent.

          4.3 RELEASE OF COLLATERAL. Effective on the Amendment Effective Date,
the Collateral Agent is hereby authorized and directed to release from the Lien
of the Security Agreement executed in connection with the Existing Credit
Agreement the Collateral identified on Annex II hereto, and from time to time
thereafter, such additional Collateral as is required to be pledged pursuant to
the terms of the New Security Agreement (defined below). Effective on the
Amendment Effective Date, the Collateral Agent is authorized and directed to
enter into the security agreement in the form attached as Exhibit A hereto (as
amended, supplemented, amended and restated or otherwise modified from time to
time, the "NEW SECURITY AGREEMENT"), covering, among other things, the
Collateral identified on Annex II.

SECTION 5. BINDING EFFECT.

     This Amendment shall become effective on and as of the date (the "AMENDMENT
EFFECTIVE DATE"), on or before December 9, 2002, on which the following
conditions are satisfied:

          (a) this Amendment shall have been executed by each Borrower, the
     Administrative Agent and the Collateral Agent, and counterparts hereof as
     so executed shall have been delivered to the Administrative Agent;

                                       14

<PAGE>

          (b) the Administrative Agent shall have been notified by the Required
     Revolving Lenders, the Required Term C Loan Lenders and the Required
     Incremental Term Lenders that such Lenders have executed this Amendment
     (which notification may be by facsimile or other written confirmation of
     such execution);

          (c) the Company shall have executed and delivered to the
     Administrative Agent for delivery to the respective Incremental Term
     Lenders an Incremental Term Loan Note reflecting the Incremental Loans of
     such Lender to the Company;

          (d) the Company and each Subsidiary party thereto shall have executed
     and delivered to the Administrative Agent, for the benefit of the Lenders,
     the New Security Agreement and all filings deemed by the Administrative
     Agent to be necessary or applicable thereunder shall have been executed and
     delivered to the Administrative Agent by the applicable Credit Party;

          (e) the Company shall have delivered to the Administrative Agent, for
     the account of the Lenders, (i) certified resolutions of the Board of
     Directors of the Company, approving the Incremental Term Loans and the
     other matters covered by this Amendment and (ii) a certificate of a
     responsible financial or accounting officer of the Company to the effect
     that, as of the Amendment Effective Date, and both before and after giving
     effect to the Incremental Term Loans, (x) the Company is in compliance with
     all of the covenants contained in sections 8 and 9 of the Credit Agreement,
     as amended hereby, (y) no Default or Event of Default has occurred and is
     continuing, and (z) all representations and warranties of the Credit
     Parties contained in the Credit Documents are true and correct in all
     material respects as if made on the Amendment Effective Date;

          (f) the Company shall have delivered to the Administrative Agent, for
     the account of the Lenders, a written opinion of Squire, Sanders & Dempsey,
     counsel for the Company, in form and substance satisfactory to the Joint
     Lead Arrangers, covering such matters incident to the transactions
     contemplated by this Amendment as the Joint Lead Arrangers may request;

          (g) the Administrative Agent shall have received for the pro rata
     account of each Consenting Lender (as defined below) a non-refundable
     amendment fee (the "AMENDMENT FEE") equal to 0.50% of the amount of the
     Commitment (after giving effect to this Amendment) of such Consenting
     Lender. The Amendment Fee shall be payable only to each Lender that has
     delivered (including by way of facsimile) its executed signature page to
     this Amendment to the attention of RACHEL RAWSON AT JONES DAY, 901 LAKESIDE
     AVENUE, CLEVELAND, OHIO 44114, FACSIMILE NUMBER, 216-579-0212, at or prior
     to 5:00 p.m. (EST) on December 6, 2002 (each, a "CONSENTING LENDER") and
     only in the event that the Amendment becomes effective in accordance with
     the terms hereof and of the Credit Agreement.

          (h) each Subsidiary Guarantor shall have delivered to the
     Administrative Agent, for the benefit of the Lenders, an Acknowledgement
     and Consent with respect to this Amendment.

                                       15

<PAGE>

          The Administrative Agent shall notify the Borrowers and each Lender in
writing of the effectiveness hereof and of the Amendment Effective Date, and
will promptly furnish a copy of this Amendment to each Lender.

SECTION 6. RATIFICATIONS.

     The terms and provisions set forth in this Amendment shall modify and
supersede all inconsistent terms and provisions set forth in the Credit
Agreement, and except as expressly modified and superseded by this Amendment,
the terms and provisions of the Credit Agreement are ratified and confirmed and
shall continue in full force and effect.

SECTION 7. REPRESENTATIONS AND WARRANTIES.

     The Borrowers represent and warrant to the Lenders and the Administrative
Agent as follows:

          (a) AUTHORIZATION, VALIDITY AND BINDING EFFECT. This Amendment has
     been duly authorized by all necessary corporate action on the part of each
     Borrower, has been duly executed and delivered by a duly authorized officer
     or officers of each Borrower, and constitutes the valid and binding
     agreement of each Borrower, enforceable against each Borrower in accordance
     with its terms.

          (b) REPRESENTATIONS AND WARRANTIES TRUE AND CORRECT. The
     representations and warranties of the Borrowers and each other Credit Party
     contained in the Credit Agreement and each other Credit Document, as
     amended hereby, are true and correct on and as of the date hereof as though
     made on and as of the date hereof, except to the extent that such
     representations and warranties expressly relate to a specified date, in
     which case such representations and warranties are hereby reaffirmed as
     true and correct as of the date when made.

          (c) NO EVENT OF DEFAULT, ETC. No condition or event has occurred or
     exists which constitutes or which, after notice or lapse of time or both,
     would constitute a Default or an Event of Default.

          (d) COMPLIANCE. The Company and each of its Subsidiaries is in full
     compliance with all covenants and agreements contained in the Credit
     Agreement, as amended hereby, and each of the other Credit Documents to
     which they are a party, and without limitation of the foregoing, each
     Subsidiary Guarantor of the Company which as of the date hereof is required
     to be a Subsidiary Guarantor, has as on or prior to the date hereof become
     a Subsidiary Guarantor under the Subsidiary Guaranty.

SECTION 8. AMENDMENT TO SUBSIDIARY GUARANTY, SECURITY AGREEMENT AND PLEDGE
           AGREEMENT

          8.1 AMENDMENT TO OTHER CREDIT DOCUMENTS. By their signatures below,
the Required Lenders hereby authorize and direct the Collateral Agent to execute
and deliver, on behalf of the Required Lenders, an amendment to each of the
Subsidiary Guaranty, the Security Agreement and the Pledge Agreement, to the
extent necessary to conform the governing law and

                                       16

<PAGE>

venue provisions thereof to the governing law and venue provisions in the Credit
Agreement, as amended by this Amendment.

SECTION 9. MISCELLANEOUS.

          9.1 SUCCESSORS AND ASSIGNS. This amendment shall be binding upon and
inure to the benefit of the borrower, each lender and the administrative agent
and their respective permitted successors and assigns.

          9.2 SURVIVAL OF REPRESENTATIONS AND WARRANTIES. All representations
and warranties made in this Amendment shall survive the execution and delivery
of this Amendment, and no investigation by the Administrative Agent or any
Lender or any subsequent Loan or issuance of a Letter of Credit shall affect the
representations and warranties or the right of the Administrative Agent or any
Lender to rely upon them.

          9.3 REFERENCE TO CREDIT AGREEMENT. The Credit Agreement and any and
all other agreements, instruments or documentation now or hereafter executed and
delivered pursuant to the terms of the Credit Agreement as amended hereby, are
hereby amended so that any reference therein to the Credit Agreement shall mean
a reference to the Credit Agreement as amended hereby.

          9.4 EXPENSES. As provided in the Credit Agreement, but without
limiting any terms or provisions thereof, the Borrower agrees to pay on demand
all costs and expenses incurred by the Administrative Agent in connection with
the preparation, negotiation, and execution of this Amendment, including without
limitation the costs and fees of the Administrative Agent's special legal
counsel, regardless of whether this Amendment becomes effective in accordance
with the terms hereof, and all costs and expenses incurred by the Administrative
Agent or any Lender in connection with the enforcement or preservation of any
rights under the Credit Agreement, as amended hereby.

          9.5 SEVERABILITY. Any term or provision of this Amendment held by a
court of competent jurisdiction to be invalid or unenforceable shall not impair
or invalidate the remainder of this Amendment and the effect thereof shall be
confined to the term or provision so held to be invalid or unenforceable.

          9.6 APPLICABLE LAW. THIS AMENDMENT WILL BE DEEMED TO BE A CONTRACT
MADE UNDER AND GOVERNED BY THE INTERNAL LAWS OF THE STATE OF NEW YORK (INCLUDING
FOR SUCH PURPOSE SECTIONS 5-1401 AND 5-1402 OF THE GENERAL OBLIGATIONS LAW OF
THE STATE OF NEW YORK).

          9.7 HEADINGS. The headings, captions and arrangements used in this
Amendment are for convenience only and shall not affect the interpretation of
this Amendment.

          9.8 ENTIRE AGREEMENT. This Amendment is specifically limited to the
matters expressly set forth herein. This Amendment and all other instruments,
agreements and documentation executed and delivered in connection with this
Amendment embody the final, entire agreement among the parties hereto with
respect to the subject matter hereof and supersede any and all prior
commitments, agreements, representations and understandings, whether written or
oral, relating to the matters covered by this Amendment, and may not be
contradicted or

                                       17

<PAGE>

varied by evidence of prior, contemporaneous or subsequent oral agreements or
discussions of the parties hereto. There are no oral agreements among the
parties hereto relating to the subject matter hereof or any other subject matter
relating to the Credit Agreement.

          9.9 JURY TRIAL WAIVER. EACH OF THE PARTIES TO THIS AMENDMENT HEREBY
IRREVOCABLY WAIVES ALL RIGHT TO A TRIAL BY JURY IN ANY ACTION, PROCEEDING OR
COUNTERCLAIM ARISING OUT OF OR RELATING TO THIS AMENDMENT, THE OTHER CREDIT
DOCUMENTS OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THEREBY. EACH PARTY HERETO
HEREBY (A) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OR ANY OTHER
PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT,
IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER, AND (B)
ACKNOWLEDGES THAT IT AND THE OTHER PARTIES HERETO HAVE BEEN INDUCED TO ENTER
INTO THIS AMENDMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATION
IN THIS SECTION.

          9.10 COUNTERPARTS. This Amendment may be executed by the parties
hereto separately in one or more counterparts, each of which when so executed
shall be deemed to be an original, but all of which when taken together shall
constitute one and the same agreement.

                                       18

<PAGE>

     IN WITNESS WHEREOF, this Amendment has been duly executed and delivered as
of the date first above written.

                                       19<PAGE>
                                                                   EXHIBIT 10.29

                                   AMENDMENT
                                       TO
                              EMPLOYMENT AGREEMENT

         This Amendment to Employment Contract is made this 20 day of December,
2002 by and between OM Group, Inc. ("Employer") and James P. Mooney
("Executive").

         WHEREAS, Executive and Employer, previously known as Mooney Acquisition
Corporation, entered into a certain employment agreement date September 20, 1991
(the "Agreement"); and

         WHEREAS, the Agreement was amended on one occasion; and

         WHEREAS, in order to secure the continued employment of the Executive
which the Company deems to be beneficial, the parties desire to amend the
Agreement again in certain respects;

         NOW, THEREFORE, in consideration of the mutual covenants contained
herein, the parties hereby agree the Agreement is amended, effective as of
December 1, 2002, in the following respects.

         1.     Paragraph (a) of Section 1 of the Agreement is hereby amended to
provide as follows:

                (a)   SERVICES. For the term set forth in Section 1(b),
         Executive shall serve as Chief Executive Officer of Employer. For as
         long as Executive is so employed, he shall devote his full productive
         time, energy, and abilities to his duties as Chief Executive Officer of
         the Employer, except for incidental attention to the management of his
         personal investments. Executive may serve on the board of directors of
         other corporations or organizations so long as such participation does
         not conflict with the interests or business of Employer or materially
         interfere with the performance of his duties hereunder.

         2.     Paragraph (b) of Section 1 of the Agreement is hereby amended to
provide as follows:

                (b)   TERM. The Employer agrees to continue to employ Executive
         and Executive agrees to continue to be employed by the Employer during
         the term of the Agreement, subject to the provisions hereinafter set
         forth. Unless terminated earlier as specifically provided herein, the
         revised term of the Agreement shall commence December 1, 2002, and
         continue until November 30, 2005; provided, however, that the Agreement
         shall be renewed automatically for one additional 12-month period on
         each anniversary of December 1, 2002 (an "Anniversary Date"), unless
         either the Employer or Executive gives contrary written notice at least
         six months prior an Anniversary Date. The revised term as renewed
         pursuant to the above provisions shall be 36 months as of an
         Anniversary Date.
<PAGE>
         3.     Paragraph (b) of Section 7 of the Agreement is hereby amended to
provide as follows:

                (b)    TERMINATION WITHOUT CAUSE. If Employer terminates
         Executive's employment without Cause, Employer shall pay Executive for
         the number of months remaining under the term of the Agreement: (i)
         100% of his current total annual monthly salary; and (ii) his "EARNED
         BONUS". Executive's earned bonus shall equal his ESTIMATED ANNUAL
         BONUS, as defined below, divided by 12 and then multiplied by the
         number of months remaining under the term of the Agreement. Executive's
         Estimated Annual Bonus shall equal the greater of (x) the average of
         Executive's annual incentive bonus paid to Executive by Employer over
         the most recent three years and (y) 75% of Executive's annual base
         salary in effect on the date of termination. Payments made under this
         Section 7(b) shall be payable during the term of the Agreement pursuant
         to the payroll practices of Employer The healthcare, life insurance,
         and nonqualified retirement benefits as well as the use of the car to
         which Executive was entitled, or was accruing, on the date of such
         termination shall be continued with respect to Executive for the period
         during which payments are made to Executive pursuant to the above
         provisions. Restricted stock granted to the Executive shall vest
         immediately in the event of Termination by Employer without cause or by
         Executive.

         4.     Paragraph (d) of Section 7 of the Agreement is hereby amended to
provide as follows:

                (d)   TERMINATION FOR DISABILITY. Employer shall have the right
         to terminate Executive's Employment on or after the date Executive
         incurs a Disability and such termination shall be treated as a
         termination without cause, except that any payments received pursuant
         to Section 7(b) shall be offset by any disability payments received
         pursuant to any disability benefit plan maintained by Employer.
         Disability for purposes of the Agreement shall mean a condition that
         renders Executive unable (as determined by Employer in good faith,
         based upon the opinion of a physician selected by Employer) to
         regularly perform his duties hereunder by reason of illness or injury
         for a period of more than six consecutive months.

         5.     Section 7 of the Agreement is hereby amended by the addition of
Paragraph (e) at the end thereof to provide as follows:

                (e)    TERMINATION BY REASON OF DEATH. In the event of
         Executive's death while in the employ of Employer, Employer shall:

                       (i) pay Executive's designated beneficiary or if there is
         no designated beneficiary, his estate, his base salary in effect on the
         date of death for the period of the term of the Agreement;

                                      -2-
<PAGE>
                       (ii) pay Executive's designated beneficiary or if there
         is no designated beneficiary, his estate, his earned bonus, determined
         pursuant to the provisions of Section 7(b) for the year in which
         Executive's death occurs;

                       (iii) make, or cause to be made, such payments and
         benefits under Employer's welfare and pension plans with respect to
         Executive pursuant to the terms of such plans; and

                       (iv) restricted stock granted to the Executive shall
         vest immediately.

         6.  Section 8 of the Agreement is hereby amended to provide as follows:

              8.    RENEWAL. The Agreement shall be renewed pursuant to the
provisions of Section 1(b) above.

         IN WITNESS WHEREOF, Employer has caused this Amendment to Employment
Agreement and Executive has executed this Amendment to Employment Agreement as
of the date first above written.

OM GROUP, INC                                 EXECUTIVE

By:                                          By:
   ---------------------------------            --------------------------------
Title:

APPROVED:

------------------------------------
Lee R. Brodeur
Chairman, Compensation Committee

                                      -3-

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