EMPLOYMENT AGREEMENT

THIS  AGREEMENT is made and entered into as of this 15th day of June 1999 by and
between HERC Products Inc., a Delaware  corporation (the  "Corporation")  and S.
STEVEN CARL ("Executive").

A.   The Corporation has employed Executive as its President and Chief Executive
     Officer and wishes to continue to employ Executive in such capacities.
B.   Executive  is willing to be  employed by the  Corporation  on the terms and
     conditions set forth below.

The Corporation and Executive agree as follows:

1.   EMPLOYMENT.

          (a)  The Corporation  will employ Executive as its President and Chief
               Executive  Officer.  Executive  will  also  serve  in such  other
               capacities,  as the Board of Directors of the  Corporation  shall
               reasonably deem necessary.  Executive will perform such duties as
               may be  required of him by the  Corporation  under and subject to
               the instruction,  direction and control of the Board of Directors
               of the Corporation.
          (b)  The Corporation will use its best efforts to elect Executive as a
               director of the Corporation during the term of this Agreement.

2.   DEVOTION TO EMPLOYMENT.

     Executive  accepts  employment  with  the  Corporation  on  the  terms  and
     conditions of this Agreement,  and will devote all of his business time and
     effort to perform his duties on behalf of the  Corporation  in his position
     as set forth in Section 1, provided,  however, that nothing herein shall be
     construed  to  prevent  Executive  from  making  and  supervising  personal
     investments.  During  the term of this  Agreement,  Executive  shall not be
     actively  engaged  in any other  business  activity  which  will in any way
     impair his ability to properly meet his  obligations to the  Corporation or
     represent any activity  competitive  with the Corporation or detrimental to
     its  business.  Executive  agrees to comply with the  reasonable  policies,
     standards and regulations of the Corporation from time to time established.

3.   COMPENSATION AND BENEFITS.

     The Corporation  agrees to pay Executive  compensation  for his services as
     follows:

     3.1  BASE SALARY.

          The Corporation  will pay Executive an annual base salary,  subject to
          withholding taxes and other normal payroll deductions,  at the rate of
          $115,500  per year with annual  increases of 15% per year for the term
          of this agreement.

     3.2  BONUSES.

          In addition to  Executive's  salary,  Executive  shall be paid a bonus
          equal to the percentage  specified below of the  Corporation's  annual
          EBITDA,   not  including   extraordinary   accounting  events  or  any
          accounting  impact from  discontinued  operations,  during each of the
          periods specified below during which this Agreement is in effect.  Any
          bonus  earned  pursuant  to the  preceding  sentence  shall be paid to
          Executive  in cash or stock of the  Company  within 30 days  after the
          amount thereof has been determined by HERC's independent  auditors. If

          the  Executive  is paid in stock the closing bid price for December 31
          of the  year  within  which  the  bonus  is due  shall be used for the
          calculation  of the amount of stock.  Executive  may also receive such
          other bonuses and increases in Base Salary,  if any, as may be awarded
          to him from  time to time by the  Corporation's  Board  of  Directors:

                       Period                            Percentage
                       ------                            ----------
                       1/l/99 - 12/31/99                    7.5%
                       1/1/2000 - 12/31/2000                7.5%

          If the Company  achieves  its EBITDA,  as  projected  in the  approved
          budget for the year,  the  Executive  shall be provided an  additional
          incentive bonus of 25,000 shares of stock in the Company for each year
          the budgeted EBITDA is achieved.

     3.3  BENEFITS.

          Executive shall be entitled to such medical, dental, disability,  life
          insurance  and  other  benefits  and  perquisites,  if  any,  no  less
          favorable than such as are afforded to other senior  executives of the
          Corporation,   subject  to  applicable   waiting   periods  and  other
          conditions.  Medical,  dental and other  health  insurance  shall also
          provide  coverage for Executive's  spouse and dependent  children,  if
          any.  Executive  shall be  entitled to three weeks of vacation in each
          employment  year and to a  reasonable  number  of  other  days off for
          religious and personal reasons.

     3.4  BUSINESS EXPENSES.

          The   Corporation   will   pay  or   reimburse   Executive   for   all
          transportation,  hotel  and  other  expenses  reasonably  incurred  by
          Executive  on  business  trips and for all other  ordinary  reasonable
          out-of-pocket  expenses actually incurred by him in the conduct of the
          business of the Corporation  against itemized vouchers  submitted with
          respect to any such  expenses  approved in accordance  with  customary
          procedures.

     3.5  AUTO ALLOWANCE.

          The  Corporation  shall  either,  at  the  Corporation's  option,  pay
          Executive  the sum of $500 per month as an  automobile  allowance  for
          business  use or  provide  Executive  with a suitable  automobile  for
          business use at the expense of the Corporation.

4.   STOCK GRANTS.

     In consideration of Executive's  employment  hereunder,  H.E.R.C.  Products
     Incorporated  will grant Executive  50,000 shares of H.E.R.C.'s  Restricted
     Common Stock.  Such stock to have the terms set forth in Schedule A annexed
     hereto.

5.   TERM.

     The term of this Agreement shall commence as of the date thereof, and shall
     continue for a term of two (2) years,  unless sooner terminated as provided
     herein.  This  agreement  is subject to automatic  renewal  under the terms
     hereof for one year periods  provided,  however,  that on or before six (6)
     months prior to the termination date under paragraph 5 hereof, upon written
     notice  provided to the  Executive  by the Company or to the Company by the
     Executive,  the  terms of this  Agreement  shall be  renegotioated  between
     Executive  and  Company  or  written  notice of intent  to  terminate  this
     Agreement  shall  otherwise  be given on such  date.  If the  agreement  is
     automatically  renewed for any one year term the salary per  paragraph  3.1
     shall remain the same as the second year of this agreement  unless adjusted
     by the Board.

6.   TERMINATION.

     This Agreement  shall  terminate prior to the end of its term: (a) upon the
     death of  Executive,  or (b) if  Executive  fails,  because  of  illness or
     incapacity,  to render the services  contemplated  by this  Agreement for a
     period of six  consecutive  months.  The  Corporation  may  terminate  this
     Agreement prior to the end of its term for cause,  upon notice to Executive
     by the Corporation.  As used herein, "cause" shall mean: (a) the refusal or
     failure  by  Executive  to carry out  specific  directions  of the Board of
     Directors of the Corporation  which are of a material nature and consistent
     with his status as Chairman  of the Board,  President  and Chief  Executive
     Officer,  or the refusal or failure by Executive to perform a material part
     of  Executive's  duties  hereunder,  or a  breach  of  any  of  Executive's
     fiduciary duties to the Corporation;  (b) fraudulent or dishonest action by
     Executive in his relations with the  Corporation or any of its  Affiliates,
     or with any  customer  or  business  contact  of the  Company or any of its
     Affiliates ("dishonest" for these purposes shall mean Executive's knowingly
     or  recklessly  making  of a  material  misstatement  or  omission  for his
     personal  benefit);  or (c)  the  conviction  of  Executive  of  any  crime
     involving an act of moral  turpitude.  Notwithstanding  the  foregoing,  no
     "cause"  for  termination   shall  be  deemed  to  exist  with  respect  to
     Executive's  acts  described in clause (a) above  unless the Company  shall
     have  given  written  notice  to  Executive  specifying  the  "cause"  with
     reasonable  particularity and, within five business days after such notice,
     Executive  shall not have cured or  eliminated  the problem or thing giving
     rise to such of cause.

7.   RESIGNATION AS DIRECTOR.

     If, for any  reason,  (a)  Executive  terminates  his  employment  with the
     Corporation, or (b) the Corporation terminates Executive's employment under
     the terms of this  Agreement,  or (c) this Agreement  expires without being
     renewed or extended,  then Executive  will resign as a director,  effective
     upon  the  occurrence  of such  termination  or  expiration,  whichever  is
     applicable.

8.   PROTECTION OF CONFIDENTIAL INFORMATION; NON-COMPETITION.

     8.1  CONFIDENTIAL INFORMATION.

     Executive  warrants  that  he is  not  subject  to any  restriction  on his
     executing and performing this Agreement, and acknowledges that:

     (a)  As a  result  of his  employment  by the  Corporation,  Executive  has
          obtained  and  will  obtain   secret  and   confidential   information
          concerning  the  business  of  the  Corporation  and  its  Affiliates,
          including,  without  limitation,  financial  information,  patents and
          other proprietary rights, trade secrets and "know-how," customers, and
          certain methodologies ("Confidential Information").

     (b)  The  Corporation and its Affiliates  will suffer  substantial  damage,
          which  will be  difficult  to  compute  if,  during  the period of his
          employment  with  the  Corporation  or  thereafter,  Executive  should
          divulge  Confidential  Information or,  thereafter,  Executive  should
          enter a business competitive with those of the Corporation.

     (c)  The  provisions of this Agreement are reasonable and necessary for the
          protection of the business of the Corporation and its Affiliates.

     8.2  MAINTAIN CONFIDENTIALITY.

     Executive  agrees that he will not at any time,  either  during the term of
     this  Agreement  or  thereafter,  divulge  to  any  person  or  entity  any
     Confidential  Information  obtained  or  learned  by him as a result of his
     employment with the Corporation or any of its Affiliates, except (a) in the
     course of  performing  his  duties  hereunder,  (b) with the  Corporation's

     express written consent;  (c) to the extent that any such information is in
     the public  domain other than as a result of  Executive's  breach of any of
     his obligations  hereunder;  or (d) where required to be disclosed by court
     order subpoena or other government  process. If Executive shall be required
     to  make  disclosure  pursuant  to  the  provisions  of  clause  (d) of the
     preceding sentence,  Executive promptly, but in no event more than 72 hours
     after learning of such subpoena,  court order, or other government process,
     shall notify,  by personal  delivery or by electronic  means,  confirmed by
     mail, the Corporation and, at the Corporation's  expense,  Executive shall:
     (i) take all  reasonably  necessary  steps  required by the  Corporation to
     defend  against  the  enforcement  of such  subpoena,  court order or other
     government  process,  and (ii)  permit the  Corporation  to  intervene  and
     participate  with counsel of its choice in any  proceeding  relating to the
     enforcement thereof.

     8.3  RECORDS.

     Upon  termination of his employment  with the  Corporation,  Executive will
     promptly deliver to the Corporation all original memoranda, notes, records,
     reports,  manuals,  drawings,   blueprints,  formula  and  other  documents
     relating to the  business of the  Corporation  and its  Affiliates  and all
     property associated therewith,  which he may then possess or have under his
     control;  provided,  however,  that  Executive  shall be entitled to retain
     copies of such  documents  reasonably  necessary to document his  financial
     relationship (both past and future) with the Corporation.

     8.4  NON-COMPETE.

     During the term of this Agreement and the  eighteen-month  period following
     the termination of Executive's  employment  with the Corporation  under the
     terms of this Agreement, Executive, without the prior written permission of
     the  Corporation,  shall not,  anywhere  in the United  States of  America,
     directly or indirectly, (a) enter into the employ of or render any services
     to any  person,  firm or  corporation  engaged in any  business  which is a
     "Competitive  Business" (as defined  below);  (b) engage in any Competitive
     Business for his own account;  (c) become  associated with or interested in
     any Competitive Business as an individual, partner, shareholder,  creditor,
     director, officer, principal, agent, employee, trustee, consultant, advisor
     or in any other relationship or capacity;  (d) employ or retain, or have or
     cause any other  person or entity to employ or  retain,  any person who was
     employed or retained by the  Corporation  in the six-month  period prior to
     the termination of Executive's employment; or (e) solicit,  interfere with,
     or  endeavor  to entice  away from the  Corporation,  for the  benefit of a
     Competitive  Business,  any of its customers or other persons with whom the
     Corporation  has a  contractual  relationship.  However,  nothing  in  this
     Agreement  shall preclude  Executive from investing his personal  assets in
     the securities of any corporation or other business entity which is engaged
     in a Competitive Business if such securities are traded on a national stock
     exchange or in the over-the-counter  market and if such investment does not
     result  in his  beneficially  owning,  at any  time,  more  than  1% of the
     publicly-traded equity securities of such Competitive Business.

     8.5  INJUNCTIVE RELIEF.

     If Executive  breaches,  or threatens to breach,  any of the  provisions of
     Sections 8.2, 8.3 or 8.4, the  Corporation  shall have the right and remedy
     to have the provisions of this Agreement specifically enforced by any court
     having equity  jurisdiction,  it being acknowledged and agreed by Executive
     that the services  being  rendered  hereunder to the  Corporation  are of a
     special,  unique and  extraordinary  character  and that any such breach or
     threatened breach will cause irreparable injury to the Corporation and that
     money damages will not provide an adequate remedy in the Corporation.

     8.6  MODIFICATION OF SCOPE.

     If any provision of Section 8.2 or 8.4 is held to be unenforceable  because
     of the scope,  duration or area of its  applicability,  the tribunal making
     such determination shall have the power to modify such scope,  duration, or
     area,  or all of them,  and such  provision  or  provisions  shall  then be
     applicable in such modified form.

9.   DEFINITIONS. AS USED IN THIS AGREEMENT:

     9.1.  "Affiliate"  shall mean any entity that,  directly or indirectly,  is
     controlled by, controlling, or under common control with the Corporation.

     9.2.  "Competitive  Business"  shall  mean a  business  which  is  directly
     competitive  with  any  business  engaged  in by  the  Corporation  or  any
     Affiliate of the Corporation.

10.  NOTICES.

     All notices  provided  for by this  Agreement  shall be made in writing and
     shall be deemed given when (a)  personally  delivered to the party entitled
     to receive it: (b)  transmitted  by electronic  means;  or (c) mailed first
     class mail, by certified mail, return receipt  requested,  addressed to the
     person  entitled  to it at the  address  set forth  below (or at such other
     address as may have been designated by written notice). The notice shall be
     deemed to be  received  on the date of its actual  delivery  or  electronic
     transmission to the party entitled thereto, or three days after mailing. If
     sent to the Corporation, notices shall be delivered to:

          HERC Products Incorporated
          2215 West Melinda Lane, Suite A
          Phoenix, Arizona 85027
          Attention: Chairman of the Board of Directors Compensation Committee
          Telecopier: (623) 233-1107

     and, if sent to Executive, notices shall be delivered to:

          S. Steven Carl
          c/o HERC Products Incorporated
          2215 West Melinda Lane, Suite A
          Phoenix, Arizona 85027
          Telecopier: (623) 233-1107

          Marked "Personal and Confidential"

11.  ASSIGNMENT.

     The rights and benefits of the  Corporation  under this Agreement  shall be
     transferable, and all covenants and agreements hereunder shall inure to the
     benefit of and be enforceable by, its successors and assigns. Executive may
     not assign  this  Agreement,  but it shall  inure to the  benefit of and be
     binding upon his heirs and legal representatives.

12.  ARBITRATION.

     In the event of any dispute between the parties as to the interpretation of
     any of the terms and  provisions  of this  agreement,  the matter  shall be
     submitted to arbitration in the following manner:

     Either  party  shall  serve  written  notice upon the other party that they
     desire to submit the dispute to arbitration and within fifteen (15) days of
     the date of any such written  notice each party shall appoint an arbitrator
     within ten (10) days  thereafter  the two  arbitrators  so  selected  shall
     appoint  a third.  In the event  either  party  shall  fail to  appoint  an
     arbitrator  within such  fifteen-day  period or if the two  arbitrators  so
     appointed shall fail to select a third within such ten-day  period,  then a
     judge of the  Superior  Court of Maricopa  County,  Arizona,  or such other
     court as may have jurisdiction thereover shall appoint such arbitrator. The
     three  arbitrators  shall  determine the controversy in accordance with the
     Rules  of  the  American  Arbitration  Association  and a  decision  of the
     majority of the arbitrators  shall bind and be conclusive upon the parties.
     The parties shall pay the expense of arbitration  in the manner  determined
     by the  arbitrators and judgment upon the award rendered by the arbitrators
     may, if permissible, be entered in any court having jurisdiction.

13.  MISCELLANEOUS.

     13.1 GOVERNING LAW.

     This  Agreement  shall be governed by and construed in accordance  with the
     laws of the State of Arizona.

     13.2 WAIVER.

          No waiver or  modification  of this Agreement shall be valid unless in
          writing and duly executed by the party to be charged therewith. Waiver
          by either  party hereto of any breach or default by the other party of
          any of the terms and provisions of this Agreement shall not operate as
          a waiver  of any  other  breach  or  default,  whether  similar  to or
          different from the breach or default waiver.

     13.3 SEVERABILITY.

          All agreements, provisions, representations,  warranties and covenants
          contained herein are severable,  and in the event that any one or more
          of them shall be held to be invalid,  illegal or  unenforceable in any
          respect by any court of competent jurisdiction, the validity, legality
          and enforceability of the remaining  provisions contained herein shall
          not in any way be  affected  thereby,  and  this  Agreement  shall  be
          interpreted as if such invalid,  illegal or unenforceable  agreements,
          provisions or covenants were not contained herein.

     13.4 ENTIRE AGREEMENT.

          This  Agreement   constitutes  and  embodies  the  full  and  complete
          understanding  and  agreement  of the  parties  hereto  provided,  and
          supersedes all prior understandings or agreements,  whether oral or in
          writing.

The parties have executed this Agreement the day and year first above written.

HERC Products Incorporated

By: _______________________________     S. Steven Carl: ________________________

Signature: ________________________

Title: ____________________________

                                   SCHEDULE A

                              TERMS OF STOCK GRANT

1.   Shares granted price is the closing bid price on June 15, 1999

2.   Shares will vest over 2 years on the following schedule:

                    Shares:                           Vesting Date:
                    -------                           -------------
                 25,000 shares                          6/l5/99
                 25,000 shares                          6/15/2000

3.   In the  event  HERC is  acquired  by  another  company  all  stock  becomes
     immediately vested.

4.   In the event HERC issues stock in a public or private  placement the shares
     will be  adjusted  in  proportion  to the new stock  issued  (Anti-dilutive
     clause).