<PAGE>   1
                                                                    EXHIBIT 10.6
PNC BANK, N.A.
National Corporate Banking
55 S. Lake Avenue, Suite 650
Pasadena, CA  91101


                                September  25, 1995

KERR GROUP, INC.
1840 Century Park East
Los Angeles, California  90067


Ladies and Gentlemen:

         Reference is hereby made to (i) that certain Receivables Purchase
Agreement, dated as of January 19, 1995 (the "Receivables Purchase Agreement"),
between the Bank and the Company, (ii) the several Note Agreements, dated as of
September 15, 1993 (the "Note Agreements"), between the Company and each of the
purchasers listed on the Schedule of Purchasers attached to such Note Agreements
(the "Purchasers"), relating to the sale by the Company of its 9.45% Series A
Senior Notes due September 15, 2003 and its 8.99% Series B Notes due September
15, 1999, and (iii) that certain letter agreement, dated September 25, 1995, in
the form attached hereto as Exhibit A (the "Letter Agreement"), between the
Company and the Purchasers.

         The Bank hereby acknowledges receipt of the Letter Agreement, and
hereby consents to the amendments to the Note Agreements set forth in the
Letter Agreement.  Notwithstanding any provision in the Note or the Receivables
Purchase Agreement to the contrary, any reference to the Note Agreements
contained in the Note and the Receivables Purchase Agreement shall mean the
Note Agreements as amended thereby.

         This consent shall not alter, waive or amend, except as expressly
provided herein, any provision of the Note or the Receivables Purchase
Agreement or impair any right or remedy of the Bank with respect to any
violation of any provision thereunder, and shall not constitute a waiver of
compliance with any covenant, term or condition to be performed or complied
with thereunder.  Except as expressly provided herein, all provision, terms and
condition of each of the Note and the Receivables Purchase Agreement shall
remain in full force and effect, and each of the Note and the Receivables
Purchase Agreement is ratified and confirmed in all respects.

                                  Very truly yours,

                                  PNC BANK, NATIONAL ASSOCIATION


                                  By:    /s/  Cynthia G. Osofsky
                                         ------------------------
                                           Cynthia G. Osofsky
                                           Senior Vice President
                                           and Regional Manager

ACKNOWLEDGED AND AGREED:

KERR GROUP, INC.

By:      /s/  Geoffrey A. Whynot
         -----------------------------------
Name:          Geoffrey A. Whynot
Title:          Treasurer


<PAGE>   2
[KERR LETTERHEAD]


To:      Each Holder of 9.45% Series A Senior Notes due
         September 15, 2003 and Each Holder of 8.99% Series B
         Senior Notes due September 15, 1999 of Kerr Group, Inc.
                                                               


Date:    September  25, 1995


         Reference is hereby made to the several Note Agreements, dated as of
September 15, 1993 (the "Note Agreements"), between Kerr Group, Inc. (the
"Company") and each of the purchasers listed on the Schedule of Purchasers
attached to said Note Agreements (the "Purchasers"), relating to the issue and
sale by the Company of its 9.45% Series A Senior Notes due September 15, 2003
and its 8.99% Series B Senior Notes due September 15, 1999 (collectively, the
"Notes").  Capitalized terms used herein and not otherwise defined have the
meanings ascribed thereto in the Note Agreements.

         I.  Amendment

             Subject to the conditions set forth herein, the Note Agreements
             are hereby amended as follows:

             A.  Section 10.1 of the Note Agreements is hereby amended and
                 restated in its entirety to read as follows:


                 10.1  Fixed Charge Coverage Ratio.  The Company will not at
                       any time on or after December 31, 1993, permit the Fixed
                       Charge Coverage Ratio for the four consecutive fiscal
                       quarters most recently ended (i.e., a "rolling" four
                       quarters) to be less than the ratios indicated below for
                       the periods indicated:

<TABLE>
<CAPTION>
                                                          Minimum Fixed Charge
                             Periods                         Coverage Ratio
             -------------------------------------           --------------
             <S>               <C>  <C>                         <C>
             Dec. 31, 1993     -    June 30, 1994               1.20 to 1
             July 1, 1994      -    June 30, 1995               1.30 to 1
             July 1, 1995      -    June 30, 1996               1.00 to 1
             July 1, 1996      -    Sept. 30, 1996              1.40 to 1
             Oct. 1, 1996      -    Dec. 31, 1996               1.50 to 1
             Jan. 1, 1997      -    June 30, 1997               1.60 to 1
             July 1, 1997      -    June 30, 2003               1.75 to 1
</TABLE>

<PAGE>   3


             B.  Section 10.9 of the Note Agreements is hereby amended and
                 restated in its entirety to read as follows:


                 10.9  Ratio of Debt to Adjusted Tangible Net Worth.  The
                       Company will not at any time permit the ratio of the
                       total Debt of the Company to Adjusted Tangible Net Worth
                       to exceed the following ratios for the indicated
                       periods:


<TABLE>
<CAPTION>
                                   Periods                      Maximum Ratio
               -----------------------------------              -------------

               <S>                                                 <C>
               Sept. 15, 1993   -   Nov. 30, 1993                  1.85 to 1
               Dec. 1, 1993     -   Feb. 28, 1994                  1.95 to 1
               Mar. 1, 1994     -   Aug. 31, 1994                  2.00 to 1
               Sept. 1, 1994    -   Nov. 30, 1994                  1.85 to 1
               Dec. 1, 1994     -   June 30, 1995                  1.95 to 1
               July 1, 1995     -   Nov. 30, 1995                  1.80 to 1
               Dec. 1, 1995     -   Aug. 31, 1996                  1.95 to 1
               Sept. 1, 1996    -   Dec. 31, 1996                  1.70 to 1
               Jan. 1, 1997     -   June 30, 1997                  1.85 to 1
               July 1, 1997     -   Nov. 30, 1997                  1.50 to 1
               Dec. 1, 1997     -   June 30, 1998                  1.80 to 1

               during each year thereafter

               July 1           -   Nov. 30                        1.50 to 1
               Dec. 1           -   June 30                        1.80 to 1
</TABLE>

         II. Miscellaneous

             A.  Limited Nature of Agreement. The amendments and modifications
                 to the Note Agreements set forth above do not and shall not,
                 now or in the future, either implicitly or explicitly (a)
                 alter, waive or amend, except as expressly provided herein,
                 any provision of the Note Agreements, or (b) impair any right
                 or remedy of any purchaser under the Note Agreements with
                 respect to any violation of any provision of the Note
                 Agreements.  The provisions hereof do not waive, now or in the
                 future, compliance with any covenant, term or condition to be
                 performed or complied with nor do they impair any rights or
                 remedies of any Purchaser under the Note Agreements, as
                 amended hereby, with respect to any such violation.

             B.  Note Agreements Remain in Effect.  Except as expressly
                 provided herein, all provisions, terms and conditions of the
                 Note Agreements shall remain in full force and effect.  As
                 amended hereby, the Note Agreements are ratified and confirmed
                 in all respects.

                                     - 2 -

<PAGE>   4


             C.  Counterparts.  This letter may be executed in any number of
                 counterparts, each of which when executed and delivered shall
                 be an original, but all of which together shall constitute one
                 and the same instrument.

             D.  Governing Law.  This letter shall in all respects be governed
                 by, and construed and enforced in accordance with, the laws of
                 the State of New York, including all matters of construction,
                 validity and performance.

         In consideration of your execution and delivery of this letter, the
Company agrees to pay to you, upon such execution and delivery by all of the
Purchasers, a fee in aggregate sum of $150,000 allocated in proportion to each
Purchaser's respective principle amount.

         If you are in agreement with the foregoing, please sign the
accompanying counterparts of this letter and return one of the same to the
Company, whereupon this letter shall become a binding agreement between you and
the Company.

                                Very truly yours,

                                KERR GROUP, INC.


                                By:     /s/ Geoffrey A. Whynot
                                        ------------------------------
                                Title:  Vice President, Treasurer


The foregoing Agreement is hereby agreed to as of the date thereof.

JOHN HANCOCK MUTUAL LIFE INSURANCE COMPANY

By:   /s/  Stephen J. Blewitt
      --------------------------------------
BARNETT & CO.

By:
      --------------------------------------
NEW YORK LIFE INSURANCE COMPANY

By:
      --------------------------------------
MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY

By:
      --------------------------------------
MASSMUTUAL/CARLSON CBO, N.V.

By:
      --------------------------------------

                                     - 3 -

<PAGE>   5


             C.  Counterparts.  This letter may be executed in any number of
                 counterparts, each of which when executed and delivered shall
                 be an original, but all of which together shall constitute one
                 and the same instrument.

             D.  Governing Law.  This letter shall in all respects be governed
                 by, and construed and enforced in accordance with, the laws of
                 the State of New York, including all matters of construction,
                 validity and performance.

         In consideration of your execution and delivery of this letter, the
Company agrees to pay to you, upon such execution and delivery by all of the
Purchasers, a fee in aggregate sum of $150,000 allocated in proportion to each
Purchaser's respective principle amount.

         If you are in agreement with the foregoing, please sign the
accompanying counterparts of this letter and return one of the same to the
Company, whereupon this letter shall become a binding agreement between you and
the Company.

                                Very truly yours,

                                KERR GROUP, INC.


                                By:     /s/ Geoffrey A. Whynot
                                        ------------------------------
                                Title:  Vice President, Treasurer


The foregoing Agreement is hereby agreed to as of the date thereof.

JOHN HANCOCK MUTUAL LIFE INSURANCE COMPANY

By:   /s/  Stephen J. Blewitt
      --------------------------------------
BARNETT & CO.

By:   /s/  Richard McCormick
      --------------------------------------
NEW YORK LIFE INSURANCE COMPANY

By:   --------------------------------------

MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY

By:
      --------------------------------------
MASSMUTUAL/CARLSON CBO, N.V.

By:
      --------------------------------------

                                     - 3 -

<PAGE>   6


             C.  Counterparts.  This letter may be executed in any number of
                 counterparts, each of which when executed and delivered shall
                 be an original, but all of which together shall constitute one
                 and the same instrument.

             D.  Governing Law.  This letter shall in all respects be governed
                 by, and construed and enforced in accordance with, the laws of
                 the State of New York, including all matters of construction,
                 validity and performance.

         In consideration of your execution and delivery of this letter, the
Company agrees to pay to you, upon such execution and delivery by all of the
Purchasers, a fee in aggregate sum of $150,000 allocated in proportion to each
Purchaser's respective principle amount.

         If you are in agreement with the foregoing, please sign the
accompanying counterparts of this letter and return one of the same to the
Company, whereupon this letter shall become a binding agreement between you and
the Company.

                                Very truly yours,

                                KERR GROUP, INC.


                                By:     /s/ Geoffrey A. Whynot
                                        ------------------------------
                                Title:  Vice President, Treasurer


The foregoing Agreement is hereby agreed to as of the date thereof.

JOHN HANCOCK MUTUAL LIFE INSURANCE COMPANY

By:
      --------------------------------------
BARNETT & CO.

By:
      --------------------------------------
NEW YORK LIFE INSURANCE COMPANY

By:   /s/  Gianfranco Capasso
      --------------------------------------
MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY

By:
      --------------------------------------
MASSMUTUAL/CARLSON CBO, N.V.

By:
      --------------------------------------

                                     - 3 -

<PAGE>   7


             C.  Counterparts.  This letter may be executed in any number of
                 counterparts, each of which when executed and delivered shall
                 be an original, but all of which together shall constitute one
                 and the same instrument.

             D.  Governing Law.  This letter shall in all respects be governed
                 by, and construed and enforced in accordance with, the laws of
                 the State of New York, including all matters of construction,
                 validity and performance.

         In consideration of your execution and delivery of this letter, the
Company agrees to pay to you, upon such execution and delivery by all of the
Purchasers, a fee in aggregate sum of $150,000 allocated in proportion to each
Purchaser's respective principle amount.

         If you are in agreement with the foregoing, please sign the
accompanying counterparts of this letter and return one of the same to the
Company, whereupon this letter shall become a binding agreement between you and
the Company.

                                Very truly yours,

                                KERR GROUP, INC.


                                By:     /s/ Geoffrey A. Whynot
                                        ------------------------------
                                Title:  Vice President, Treasurer


The foregoing Agreement is hereby agreed to as of the date thereof.

JOHN HANCOCK MUTUAL LIFE INSURANCE COMPANY

By:
      --------------------------------------
BARNETT & CO.

By:
      --------------------------------------
NEW YORK LIFE INSURANCE COMPANY

By:
      --------------------------------------
MASSACHUSETTS MUTUAL LIFE INSURANCE COMPANY

By:   /s/  Richard C. Morrison
      --------------------------------------
MASSMUTUAL/CARLSON CBO, N.V.

By:   /s/  Richard C. Morrison
      --------------------------------------

                                     - 3 -