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                                                                    EXHIBIT 99.2
 
                           PCI CHEMICALS CANADA INC.
 
                                 EXCHANGE OFFER
                               TO HOLDERS OF ITS
                 9 1/4% SERIES A SENIOR SECURED NOTES DUE 2007
 
                         NOTICE OF GUARANTEED DELIVERY
 
     As set forth in the Prospectus dated January   , 1998 (the "Prospectus") of
PCI Chemicals Canada Inc. (the "Company" and, together with Pioneer Americas
Acquisition Corporation ("PAAC") and the other subsidiaries of PAAC, the
"Issuers") under "The Exchange Offer -- How to Tender" and in the Letter of
Transmittal (the "Letter of Transmittal") relating to the offer (the "Exchange
Offer") by the Issuers to exchange up to $175,000,000 in principal amount of its
9 1/4% Series A Senior Secured Notes due 2007 issued and sold in a transaction
exempt from registration under the Securities Act of 1933, as amended (the
"Original Notes"), for $175,000,000 in principal amount of its 9 1/4% Series B
Senior Secured Notes due 2007 (the "Exchange Notes"), this form or one
substantially equivalent hereto must be used to accept the Exchange Offer of the
Issuers if: (i) certificates for the Original Notes are not immediately
available; or (ii) time will not permit all required documents to reach the
Exchange Agent (as defined below) on or prior to the Expiration Date (as defined
in the Prospectus) of the Exchange Offer. Such form may be delivered by hand or
transmitted by telegram, telex, facsimile transmission or letter to the Exchange
Agent.
 
TO: UNITED STATES TRUST COMPANY OF NEW YORK (the "Exchange Agent")
 
                                 By Facsimile:
                                 (212) 780-0592
                          Attention: Customer Service
 
                             Confirm by telephone:
                                 (800) 548-6565
 
                        By Registered or Certified Mail:
                    United States Trust Company of New York
                          P.O. Box 844 Cooper Station
                            New York, New York 10276
 
                                    By Hand:
                    United States Trust Company of New York
                                  111 Broadway
                            New York, New York 10006
                     Attention: Corporate Trust Operations
 
                             By Overnight Courier:
                    United States Trust Company of New York
                                  770 Broadway
                            New York, New York 10003
                     Attention: Corporate Trust Operations
 
              DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OTHER THAN
            AS SET FORTH ABOVE OR TRANSMITTAL OF THIS INSTRUMENT TO
              A FACSIMILE OR TELEX NUMBER OTHER THAN AS SET FORTH
                  ABOVE DOES NOT CONSTITUTE A VALID DELIVERY.
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Ladies and Gentlemen:
 
     The undersigned hereby tenders to the Issuers, upon the terms and
conditions set forth in the Prospectus and the Letter of Transmittal (which
together constitute the "Exchange Offer"), receipt of which are hereby
acknowledged, the principal amount of Original Notes set forth below pursuant to
the guaranteed delivery procedure described in the Prospectus and the Letter of
Transmittal.
 

                                                    
                                                       SIGN HERE
Principal Amount of Original Notes
Tendered -------------------------------------------   Signature(s) ---------------------------------------
                                                       -----------------------------------------------------
Certificate Nos.                                       Please Print the Following Information
(if available)
  ---------------------------------------
                                                       Name(s) -------------------------------------------
                                                       -----------------------------------------------------
Total Principal Amount                                 Address --------------------------------------------
  Represented by Original Notes
 
  Certificate(s)
     ----------------------------------------
                                                       -----------------------------------------------------
 
                                                       Area Code and Tel. No(s). ------------------------
                                                       -----------------------------------------------------
Account Number ----------------------------------
Dated: ------------------ , 1998

 
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                                   GUARANTEE
 
     The undersigned, a member of a recognized signature guarantee medallion
program within the meaning of Rule 17A(d)-15 under the Securities Exchange Act
of 1934, as amended, hereby guarantees that delivery to the Exchange Agent of
certificates tendered hereby, in proper form for transfer, or delivery of such
certificates pursuant to the procedure for book-entry transfer, in either case
with delivery of a properly completed and duly executed Letter of Transmittal
(or facsimile thereof) and any other required documents, is being made within
five trading days after the date of execution of a Notice of Guaranteed Delivery
of the above-named person.
 
- --------------------------------------------------------------------------------
                                  Name of Firm
 
- --------------------------------------------------------------------------------
                              Authorized Signature
 
- --------------------------------------------------------------------------------
                         Number and Street or P.O. Box
 
- --------------------------------------------------------------------------------
                           City        State Zip Code
 
- --------------------------------------------------------------------------------
                             Area Code and Tel. No.
 
Dated:             , 1998
 
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