H E R C PRODUCTS INC
SC 13D/A, 1996-09-09
SPECIALTY CLEANING, POLISHING AND SANITATION PREPARATIONS
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                    -----------------------------------------
                               (Amendment No. 1)*

                         H.E.R.C. Products Incorporated
                         ------------------------------
                                (Name of Issuer)

                          Common Stock, $.01 par value
                          ----------------------------
                           (Title Class of Securities)

                                   404156-10-2
                                 -------------
                                 (CUSIP Number)

                             David Alan Miller, Esq.
                            Graubard Mollen & Miller
                 600 Third Avenue, New York, New York 10016-2097
            --------------------------------------------------------
            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)


                                 August 23, 1996
             -------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box |_|.

Check the following box if a fee is being paid with the statement |X|. (A fee is
not required only if the reporting person:  (1) has a previous statement on file
reporting  beneficial  ownership  of more  than  five  percent  of the  class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial  ownership of five percent or less of such class.)
(See Rule 13d-7.).

Note: Six copies of this statement, including all exhibits, should be filed with
the Commission.  See Rule 13d-1(a) for other parties to whom copies are to be 
sent.

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).

                                Page 1 of 6 pages

                                                       
<PAGE>

                                  SCHEDULE 13D

- ---------------------                                        -----------------
CUSIP No. 404156-10-2                                        Page 2 of 6 Pages
- ---------------------                                        -----------------

- ------------------------------------------------------------------------------
1    NAME OF REPORTING PERSON
     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          David Thalheim
- ------------------------------------------------------------------------------
2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*       (a) |_|
                                                             (b) |_|
          N/A
- ------------------------------------------------------------------------------
3    SEC USE ONLY


- ------------------------------------------------------------------------------
4    SOURCE OF FUNDS*

          PF
- ------------------------------------------------------------------------------
5    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
     TO ITEMS 2(d) OR 2(e)  |_|

- ------------------------------------------------------------------------------
6    CITIZENSHIP OR PLACE OF ORGANIZATION

         United States
- ------------------------------------------------------------------------------
                  7    SOLE VOTING POWER
 NUMBER OF
  SHARES                    58,824
BENEFICIALLY      ------------------------------------------------------------
 OWNED BY         8    SHARED VOTING POWER
   EACH        
REPORTING                   117,648
  PERSON          ------------------------------------------------------------
   WITH           9    SOLE DISPOSITIVE POWER

                            58,824
                  ------------------------------------------------------------
                  10   SHARED DISPOSITIVE POWER

                            117,648
- ------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

         176,472 shares (See Item 5(a)
- ------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

         The reporting person disclaims beneficial ownership of 94,654 shares
- ------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

         2.7%
- ------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

         IN
- ------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
      (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

<PAGE>

Item 1.  Security and Issuer.

                  The class of equity securities to which this statement relates
is the common stock, $.01 par value (the "Common Stock"),  of H.E.R.C.  Products
Incorporated (the "Issuer"),  a Delaware corporation,  whose principal executive
offices are located at 3622 North 34th Avenue, Phoenix, Arizona 85017.

                  The  percentage  of  beneficial  ownership  reflected  in this
statement is based upon 6,253,277  shares of Common Stock  outstanding on August
23, 1996, which number has been provided to the Reporting Person by the Issuer.

Item 2.  Identity and Background.

                  No change to this Item.

Item 3.  Source and Amount of Funds or other Consideration.

                  The transactions covered by this Amendment No. 1 ("Amendment")
to the Schedule 13D of Thalheim were sales of Common Stock. Therefore, Item 3 is
not currently applicable.

Item 4.  Purpose of Transactions.

                  The following replaced prior Item 4:

                  The transactions covered by this Amendment were sales in order
to realize a profit on a portion of  Thalheim's  investment  represented  by the
Common Stock.

                  Thalheim  may acquire or dispose of  additional  shares of the
Issuer,  but does not presently  intend to do so,  although  this  intention may
change  depending  upon market  conditions.  Thalheim has no present plans which
relate to or would result in: an extraordinary corporate transaction,  such as a
merger,  reorganization  or  liquidation,  involving  the  issuer  or any of its
subsidiaries; a sale or transfer of a material amount of assets of the Issuer or
any of its  subsidiaries;  any  change  in the  present  board of  directors  or
management of the Issuer,  including any plans or proposals to change the number
or term of  directors  or to fill  any  existing  vacancies  on the  board;  any
material change in the present  capitalization or dividend policy of the Issuer;
any other  material  change in the  Issuer's  business or  corporate  structure;
changes in the Issuer's charter, by-laws or instruments corresponding thereto or
other actions which may impede the  acquisition  of control of the Issuer by any
person;  causing  a class of  securities  of the  Issuer to be  delisted  from a
national  securities  exchange or to cease to be  authorized  to be quoted in an
inter-dealer  quotation system of a registered national securities  association;
causing  a class of  equity  securities  of the  Issuer  becoming  eligible  for
termination of registration  pursuant to Section  12(g)(4) of the Securities and
Exchange Act of 1934; or any action similar to the above.


                                     3 of 6

<PAGE>

Item 5.  Interest in Securities of the Issuer.

                  The following replaces prior Item 5:

                  (a)  Thalheim  directly  owns  58,824  Common  Stock  Purchase
Warrants ("Warrants").  Each Warrant entitles the holder thereof to purchase one
share of  Common  Stock at an  exercise  price  of $2.00  per  share at any time
through and including April 3, 1999.

             Dalewood Associates, L.P. directly owns 117,648 Warrants.  Dalewood
Associates, L.P. is a limited partnership of which the corporate general partner
is Dalewood Associates, Inc. Thalheim is the owner of 50% of the common stock of
Dalewood Associates, Inc. and is an officer and director of Dalewood Associates,
Inc.;  therefore  Thalheim shares voting and  dispositive  powers with the other
officers  and  directors  over the Common Stock  beneficially  owned by Dalewood
Associates,  L.P.  Each of Dalewood  Associates,  Inc. and Thalheim is a limited
partner of Dalewood Associates,  L.P. Thalheim disclaims beneficial ownership of
94,654 Warrants owned by Dalewood Associates, L.P. representing shares of Common
Stock and  Warrants  owned by the  other  officers  and  directors  of  Dalewood
Associates,  Inc. and the limited partners of Dalewood  Associates,  L.P., other
than Thalheim.

                  (b) Thalheim has sole voting and  dispositive  powers over the
58,824 shares of Common Stock  beneficially  owned by Thalheim and shared voting
and  dispositive  powers over the 117,648  shares of Common  Stock  beneficially
owned  by  Dalewood  Associates,  L.P.,  as  described  in Item  5(a).  Thalheim
disclaims beneficial ownership of 94,654 shares of Common Stock.

                  (c) The following  listed  sales of  Common Stock were made by
Thalheim and  Dalewood  Associates, L.P. on  The  Nasdaq  SmallCap Market.  Each
transaction was an open market sale at the then current market price:

Thalheim:

                          Number of Shares of
Date                       Common Stock Sold            Price Per Share

June 18, 1996                    20,000                      $1.35

July 23, 1996                    10,000                      $1.50

August 20, 1996                  10,000                      $1.50

August 23, 1996                  18,824                      $1.50


                                     4 of 6

<PAGE>

Dalewood Associates, L.P.

                          Number of Shares of
Date                       Common Stock Sold           Price Per Share
 
June 18, 1996                    50,000                      $1.35

July 1, 1996                     10,000                      $1.55

July 23, 1996                    30,000                      $1.50

August 20, 1996                  10,000                      $1.50

August 23, 1996                  17,648                      $1.50



Item 6.  Contracts, Agreements, Understandings or
         Relationships with Respect to Securities of Issuer.

                  No change to this Item.

Item 7.  Materials to be Filed as Exhibits.

                  Exhibit           1:  Form of  Subscription  Agreement,  dated
                                    April  3,  1996,   between  the  Issuer  and
                                    investors.  (Incorporated  by reference from
                                    Exhibit  (10)(11) to Issuer's  Annual Report
                                    on Form  10-KSB  for the  fiscal  year ended
                                    December 31, 1996 - File No. 1-13012.)

                  Exhibit           2: Form of  Warrant  to  purchase  shares of
                                    Common   Stock  of  the  Issuer   issued  to
                                    investors.  (Incorporated  by reference from
                                    Exhibit  (10)(10) to Issuer's  Annual Report
                                    on Form  10-KSB  for the  fiscal  year ended
                                    December 31, 1996 - File No. 1-13012.)

                  Exhibit 3:        Schedule  of  Differences of agreements with
                                    Thalheim and  Dalewood Associates, L.P. from
                                    the forms.  (Previously filed)


                                     5 of 6

<PAGE>
                                    SIGNATURE


                  After reasonable  inquiry and to the best of his knowledge and
belief,  it is certified  that the  information  set forth in this  statement is
true, complete and correct.


Dated:  September 9, 1996

                                                /s/ David Thalheim
                                                -----------------------------
                                                David Thalheim


                                     6 of 6

<PAGE>



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