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): ------------------------------------------------------------- 2 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. 3 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. 4