NOTICE OF GUARANTEED DELIVERY
                                      FOR
                                  GENTEK INC.
                     11% SENIOR SUBORDINATED NOTES DUE 2009

     This form or one substantially equivalent hereto must be used to accept the
Exchange Offer of GenTek Inc. (the 'Issuer' or the 'Company') made pursuant to
the Prospectus, dated December 3, 1999 (the 'Prospectus'), if certificates (as
applicable) for outstanding 11% Senior Subordinated Notes Due 2009 (the 'Old
Notes') of the Issuer are not immediately available or if the procedure for
book-entry transfer cannot be completed on a timely basis or time will not
permit all required documents to reach U.S. Bank Trust National Association, as
exchange agent (the 'Exchange Agent') prior to 5:00 p.m., New York City time, on
the Expiration Date of the Exchange Offer. Such form may be delivered or
transmitted by facsimile transmission, mail or hand delivery to the Exchange
Agent as set forth below. In addition, in order to utilize the guaranteed
delivery procedure to tender Old Notes pursuant to the Exchange Offer, a
completed, signed and dated Letter of Transmittal (or facsimile thereof)
relating to the tender for exchange of Old Notes (the 'Letter of Transmittal')
must also be received by the Exchange Agent prior to 5:00 p.m., New York City
time, on the Expiration Date. Capitalized terms not defined herein are defined
in the Prospectus or the Letter of Transmittal.

          Delivery To: U.S. BANK TRUST NATIONAL ASSOCIATION, EXCHANGE AGENT


                                            
 By Mail, Hand Delivery or Overnight Carrier:              For Information Call:
     U.S. Bank Trust National Association                      (800) 934-6802
             180 East 5th Street
          St. Paul, Minnesota 55101                    Facsimile Transmission Number:
        Attention: Specialized Finance                         (651) 244-1537


     DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OTHER THAN AS SET FORTH ABOVE, OR
TRANSMISSION OF INSTRUCTIONS VIA FACSIMILE OTHER THAN AT SET FORTH ABOVE, WILL
NOT CONSTITUTE A VALID DELIVERY.

              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY


     Ladies and Gentlemen:

     Upon the terms and conditions set forth in the Prospectus and the
accompanying Letter of Transmittal, the undersigned hereby tenders to the
Company the principal amount of Old Notes set forth below pursuant to the
guaranteed delivery procedure described in 'The Exchange Offer -- Guaranteed
Delivery Procedures' section of the Prospectus.


    Certificate Number(s)
   (if known) of Existing
      Notes or Account                                             Aggregate Principal
     Number at the Book-            Aggregate Principal              Amount Tendered
   Entry Transfer Facility          Amount Represented             (if less than all)*
                                                        
- -----------------------------  -----------------------------  -----------------------------

- -----------------------------  -----------------------------  -----------------------------

- -----------------------------  -----------------------------  -----------------------------

- -----------------------------  -----------------------------  -----------------------------




*  Unless otherwise indicated, the Holder will be deemed to have tendered the
   full aggregate principal amount represented by such Old Notes.

ALL AUTHORITY HEREIN CONFERRED OR AGREED TO BE CONFERRED SHALL SURVIVE THE DEATH
OR INCAPACITY OF THE UNDERSIGNED AND EVERY OBLIGATION OF THE UNDERSIGNED
HEREUNDER SHALL BE BINDING UPON THE HEIRS, PERSONAL REPRESENTATIVES, SUCCESSORS
AND ASSIGNS OF THE UNDERSIGNED.

                                PLEASE SIGN HERE


                                                           
      -------------------------------------------------          --------------
X     Signature(s) of Owner(s) or Authorized Signatory                     Date

      Area Code and Telephone Number:-----------------


     Must be signed by the Holder(s) of Old Notes as their name(s) appear(s) on
certificates for Old Notes or on a security position listing, or by person(s)
authorized to become registered Holder(s) by endorsement and documents
transmitted with this Notice of Guaranteed Delivery. If signature is by a
trustee, executor, administrator, guardian, attorney-in-fact, officer or other
person acting in a fiduciary or representative capacity, such person must set
forth his or her full title below.

                      PLEASE PRINT NAME(S) AND ADDRESS(ES)

Name(s):     -------------------------------------------------------------

Capacity:    -------------------------------------------------------------

Address(es): -------------------------------------------------------------

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                                   GUARANTEE
                    (NOT TO BE USED FOR SIGNATURE GUARANTEE)

     The undersigned, a member firm of a registered national securities exchange
or of the National Association of Securities Dealers, Inc., a commercial bank or
trust company having an office or correspondent in the United States or an
'eligible guarantor institution' within the meaning of Rule 17Ad-15 under the
Securities Exchange Act of 1934, as amended, hereby guarantees that the
certificates representing the principal amount of Old Notes tendered hereby in
proper form for transfer, or timely confirmation of the book-entry transfer of
such Old Notes into the Exchange Agent's account at The Depository Trust Company
pursuant to the procedures set forth in 'The Exchange Offer -- Guaranteed
Delivery Procedures' section of the Prospectus, together with any required
signature guarantee and any other documents required by the Letter of
Transmittal, will be received by the Exchange Agent at the address set forth
above, no later than three New York Stock Exchange trading days after the date
of execution of this Notice of Guaranteed Delivery.

__________________________________________________
Name of Firm
__________________________________________________
Address
__________________________________________________
                                        (Zip Code)
Area Code and Tel. No.: __________________________

__________________________________________________
           Authorized Signature
__________________________________________________
                      Title
Name: ____________________________________________
               (Please Type or Print)

Dated: ___________________________________________

NOTE:  DO NOT SEND CERTIFICATES FOR OLD NOTES WITH THIS FORM. CERTIFICATES FOR
       OLD NOTES SHOULD BE SENT ONLY WITH A COPY OF YOUR PREVIOUSLY EXECUTED
       LETTER OF TRANSMITTAL.

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                 INSTRUCTIONS FOR NOTICE OF GUARANTEED DELIVERY

     1. Delivery of this Notice of Guaranteed Delivery. A properly completed and
duly executed copy of this Notice of Guaranteed Delivery and any other documents
required by this Notice of Guaranteed Delivery must be received by the Exchange
Agent at its address set forth herein prior to 5:00 p.m., New York City time, on
the Expiration Date. The method of delivery of this Notice of Guaranteed
Delivery and any other required documents to the Exchange Agent is at the
election and risk of the Holder and the delivery will be deemed made only when
actually received by the Exchange Agent. If delivery is by mail, registered or
certified mail properly insured, with return receipt requested, is recommended.
In all cases sufficient time should be allowed to assure timely delivery. For a
description of the guaranteed delivery procedure, see Instruction 1 of the
Letter of Transmittal.

     2. Signatures of this Notice of Guaranteed Delivery. If this Notice of
Guaranteed Delivery is signed by the registered Holder(s) of the Old Notes
referred to herein, the signature must correspond with the name(s) written on
the face of the Old Notes without alteration, enlargement, or any change
whatsoever. If this Notice of Guaranteed Delivery is signed by a participant of
the Book-Entry Transfer Facility whose name appears on a security position
listing as the owner of Old Notes, the signature must correspond with the name
shown on the security position listing as the owner of the Old Notes.

     If this Notice of Guaranteed Delivery is signed by a person other than the
registered Holder(s) of any Old Notes listed or a participant of the Book-Entry
Transfer Facility, this Notice of Guaranteed Delivery must be accompanied by
appropriate bond powers, signed as the name of the registered Holder(s) appears
on the Old Notes or signed as the name of the participant shown on the
Book-Entry Transfer Facility's security position listing.

     If this Notice of Guaranteed Delivery is signed by a trustee, executor,
administrator, guardian, attorney-in-fact, officer of a corporation, or other
person acting in a fiduciary or representative capacity, such person should so
indicate when signing.

     3. Requests for Assistance or Additional Copies. Questions and requests for
assistance and requests for additional copies of the Prospectus may be directed
to the Exchange Agent at the address specified in the Prospectus. Holders may
also contact their broker, dealer, commercial bank, trust company, or other
nominee for assistance concerning the Exchange Offer.

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