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                                                                    EXHIBIT 10.2

                                   AGREEMENT

     THIS AGREEMENT is dated as of April 5, 2000 among Questor Partners Fund,
L.P., a Delaware limited partnership, Questor Side-by-Side Partners, L.P., a
Delaware limited partnership, (collectively "Questor") and IMPCO Technologies,
Inc., a Delaware corporation (the "Company").

WHEREAS
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The Company is working with FleetBoston Robertson Stephens Inc. ("Lead Bank"),
with whom representatives of Questor have had discussions in the last week, and
other investment bankers in preparing an S-3 registration statement and
preparing for a primary underwritten offering to be led by Lead Bank prior to
July 31, 2000 (the "Primary Offering").

NOW THIS AGREEMENT WITNESSETH:
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The parties hereto, intending to be legally bound, hereby agree as follows:

1.  The Company will include (on customary terms, including indemnification of
    selling stockholders) 875,000 (or such lesser number requested by Questor)
    of Questor's shares of the Company's Common Stock in the Primary Offering,
    such number to be reduced by (i) any public sales of Common Stock by Questor
    under Rule 144 on or after the date of this agreement and prior to
    consummation of the Primary Offering, and (ii) if prior to consummation of
    the Primary Offering Questor sells at least 700,000 shares of the Company's
    Common Stock in a private transaction to a buyer that was brought to Questor
    by the Company, 50% of the aggregate number of shares sold by Questor in
    such private transaction (such net number of shares, the "First Tranche").
    Questor shall have no obligation to consummate any such private sale. The
    Company will pay all expenses incurred by the Company associated with the
    Primary Offering, other than underwriting concessions and discounts on
    shares included by Questor and fees of Questor's counsel. In connection with
    the Primary Offering, Questor will agree to enter into a customary
    underwriting agreement with the underwriters, provided, however, Questor's
    indemnification obligations will be limited to its representations,
    warranties and agreements as to its ownership of shares, its authorization
    of the sale of such shares and similar matters and to information expressly
    provided by it for inclusion in the registration statement. Questor will
    also enter into a standard lock-up agreement with the underwriters on the
    same form provided to other affiliates and officers and directors that is
    consistent with the terms of this agreement.

2.  Questor's shares will be the first shares included in the Primary Offering
    (and conversely, will be the last shares cut-back).

3.  In addition to the Company's obligations under paragraph 1, if Questor holds
    more than 75,000 shares of the Company's Common Stock, Questor may demand in
    writing that the Company register some or all of the shares that it holds on
    Form S-3. Questor may exercise its right to demand registration at any time
    on or after the earliest of (i) thirty days following the effective date of
    the Primary Offering or (ii) the date on which the Lead Bank advises the
    Company that it will not be proceeding as lead manager with respect to the
    Primary Offering or (iii) July 31, 2000. The written demand shall state the
    number of shares that Questor desires the Company to register. If the
    Primary Offering does not occur before July 31, 2000, Questor shall have the
    right to exercise a demand on two occasions, otherwise Questor shall have
    the right to exercise a demand on only one occasion. Upon receipt of a
    demand meeting the foregoing requirements, the Company at its expense will
    promptly prepare, file and use reasonable efforts to have declared effective
    a stand-alone S-3 registration statement covering all shares of the
    Company's Common stock that Questor has stated it wishes to have registered
    in such registration. The Company will use its best efforts to maintain the
    effectiveness of any registration statement filed in response to Questor's
    demand until the earlier of the sale of all of the shares covered by the
    registration statement or the expiration of two years from the effective
    date of the registration statement (three years if Questor is not able to
    sell all of the First Tranche in the Company's Primary offering by
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    July 31, 2000). Each such registration will provide for a broad manner of
    distribution (e.g., block trades, ordinary broker transactions, privately
    negotiated sales and, if Questor provides the necessary information,
    underwritten offerings), and the Company and Questor will sign a
    registration rights agreement providing for the Company's cooperation with
    any secondary offering by Questor (including indemnification of the selling
    stockholders and underwriters by the Company) and other customary terms.

4.  Questor will not sell publicly (except under the Primary Offering), without
    the consent of the Lead Bank, any shares of the Company's Common Stock
    during a period (the "Interim Period") beginning on the date of this
    agreement and ending on the earliest to occur of (i) the consummation of the
    Primary Offering, (ii) July 31, 2000, if no Primary Offering that includes
    the First Tranche has been consummated by July 31, 2000, and (iii) the date
    on which the Lead Bank advises the Company that it will not be proceeding as
    lead manager with respect to the Primary Offering.

5.  If a Primary Offering that includes all of the First Tranche is consummated
    by July 31, 2000, Questor will not sell publicly (except under the Primary
    Offering), without the prior written consent of the Lead Bank any shares of
    the Company's Common Stock for a period beginning on the day prior to the
    consummation of the Primary Offering and ending 135 days after the effective
    date of the Primary Offering. The 135 day period specified in the preceding
    sentence shall be shortened to any shorter period that applies to any
    officer, director or other person who is an affiliate by virtue of share
    ownership on the date of this agreement; provided, however, this provision
    shall not apply to (i) case by case exceptions made by the Lead Bank or (ii)
    up to 1000 shares for each person who becomes an officer after the date of
    this agreement or who own no shares on the date of this agreement who in
    either case receives the shares by virtue of purchases upon exercise of
    options or similar rights.

6.  Persons designated by Questor on the Company's Board of Directors will
    resign from the Board prior to the effective date of the Primary Offering.
    If the directors have resigned and the Primary Offering does not occur by
    July 31, 2000 or the Primary Offering does occur before that date, but on
    the first anniversary of the date of this agreement Questor continues to
    hold at least 500,000 shares of the Company's Common Stock, then upon
    receipt of a written request to appoint or elect a person designated by
    Questor to become a member of the Company's Board of Directors, naming a
    person who is willing to become a director, the Company will take all action
    necessary and within its power and will use all reasonable good faith
    efforts to cause such person to be appointed or elected to the Board.

7.  It is understood by the parties that this agreement will be disclosed in
    connection with one or more filings with the Securities and Exchange
    Commission.

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IN WITNESS WHEREOF, the parties have executed this agreement as of the date
first written above.

                              QUESTOR PARTNERS FUND, L.P.

                              By: Questor General Partner, L.P., its general
                                  partner

                                    By: Questor Principals, Inc, its general
                                        partner

                                    By:  /s/    [SIGNATURE ILLEGIBLE]
                                                ---------------------------
                                         Name:  [SIGNATURE ILLEGIBLE]

                                         Title: Managing Director

                              QUESTOR SIDE-BY-SIDE PARTNERS, L.P.

                              By: Questor Principals, Inc, its general partner

                              By:  /s/     [SIGNATURE ILLEGIBLE]
                                           --------------------------------
                                    Name:  [SIGNATURE ILLEGIBLE]

                                    Title: Managing Director

                              IMPCO TECHNOLOGIES, INC.

                               By:  /s/    WILLIAM BRIAN OLSON
                                           --------------------------------
                                    Name:  William Brian Olson

                                    Title: Chief Financial OfficerTHE TIREX CORPORATION
                          CERTIFICATE OF THE SECRETARY

         The Board of Directors of THE TIREX CORPORATION (the "Company"), has
adopted the following resolution which is now in full force and effect:

                  RESOLVED, that the Board of Directors of the Company has
authorized sixty thousand, three hundred ninety five (60,395) Shares of Common
Stock of the Company heretofore issued to John L. Threshie, Jr. to be registered
on Form S-8 to which shares were issued in lieu of cash compensation for
services rendered for which shares the Company has received full and adequate
consideration;

                  RESOLVED, that the Board of Directors of the Company has
authorized one hundred eighty eight thousand (188,000) Shares of Common Stock of
the Company heretofore issued to Linda T. Pellegrino to be registered on Form
S-8 to which shares were issued in lieu of cash compensation for legal services
rendered for which shares the Company has received full and adequate
consideration.

         IN WITNESS WHEREOF, I, as Secretary of said Corporation, have hereunto
set my hand and affixed the seal of the Company on this 4th Day of April, 2000.

                                               /s/ Michael D.A. Ash
                                               ---------------------------
                                               Michael D.A. Ash, Secretary

                                      -10-

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