Document:

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THIS WARRANT AND THE SECURITIES ISSUABLE UPON EXERCISE OF THIS WARRANT HAVE NOT
BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES
ACT"), AND MAY NOT BE SOLD, OFFERED FOR SALE, ASSIGNED, TRANSFERRED OR OTHERWISE
DISPOSED OF, UNLESS REGISTERED PURSUANT TO THE PROVISIONS OF THE SECURITIES ACT
OR AN OPINION OF COUNSEL IS OBTAINED STATING THAT SUCH DISPOSITION IS IN
COMPLIANCE WITH AN AVAILABLE EXEMPTION FROM SUCH REGISTRATION.

August 7, 2000

                           SYSTEMONE TECHNOLOGIES INC.

              (Incorporated under the laws of the State of Florida)

               WARRANT FOR THE PURCHASE OF SHARES OF COMMON STOCK

No. WRT-__

         FOR VALUE RECEIVED, SYSTEMONE TECHNOLOGIES INC., a Florida corporation
(the "Company"), hereby certifies that ______________________ or assigns (the
"Holder") is entitled, subject to the provisions of this Warrant, to purchase
from the Company, up to _______________________ fully paid and non-assessable
shares of Common Stock at a price of $3.50 per share (the "Exercise Price").

         The term "Common Stock" means the Common Stock, par value $.001 per
share, of the Company as constituted on the date of issuance of this Warrant
(the "Base Date"). The number of shares of Common Stock to be received upon the
exercise of this Warrant may be adjusted from time to time as hereinafter set
forth. The shares of Common Stock deliverable upon such exercise, and as
adjusted from time to time, are hereinafter referred to as "Warrant Stock." The
term "Other Securities" means any other equity or debt securities that may be
issued by the Company in addition thereto or in substitution for the Warrant
Stock in accordance with the terms hereof. The term "Company" means and includes
the corporation named above as well as (i) any immediate or more remote
successor corporation resulting from the merger or consolidation of such
corporation (or any immediate or more remote successor corporation of such
corporation) with another corporation, or (ii) any corporation to which such
corporation (or any immediate or more remote successor corporation of such
corporation) has transferred its property or assets as an entirety or
substantially as an entirety.

         Upon receipt by the Company of evidence reasonably satisfactory to it
of the loss, theft, destruction or mutilation of this Warrant, and (in the case
of loss, theft or destruction) of reasonably satisfactory indemnification, and
upon surrender and cancellation of this Warrant, if mutilated, the Company shall

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execute and deliver a new Warrant of like tenor and date. Any such new Warrant
executed and delivered shall constitute an additional contractual obligation on
the part of the Company, whether or not this Warrant so lost, stolen, destroyed
or mutilated shall be at any time enforceable by anyone.

         The Holder agrees with the Company that this Warrant is issued, and all
the rights hereunder shall be held subject to, all of the conditions,
limitations and provisions set forth herein.

         1.       EXERCISE OF WARRANT.

                  1.1 CASH EXERCISE. This Warrant may be exercised, in whole or
in part, at any time, or from time to time during the period commencing on the
date hereof and expiring 5:00 p.m. Eastern Time on the fifth anniversary of the
Base Date (the "Expiration Date"), by presentation and surrender of this Warrant
to the Company at its principal office, or at the office of its stock transfer
agent, if any, with the Warrant Exercise Form attached hereto duly executed and
accompanied by payment (either in cash or by certified or official bank check,
payable to the order of the Company) of the Exercise Price for the number of
shares specified in such form and instruments of transfer, if appropriate, duly
executed by the Holder or his or her duly authorized attorney; provided,
however, that, prior to the date which falls nine months after the Base Date,
this Warrant may not be exercised with respect to in excess of 50% of the
maximum amount of Warrant Stock issuable under this Warrant and, prior to the
first anniversary of the Base Date, this Warrant may not be exercised with
respect to in excess of 75% of the maximum amount of Warrant Stock issuable
under this Warrant; and, provided, further, that, in the event the entire Loan
(as hereinafter defined), and all interest thereon, advanced by the original
Holder of this Warrant pursuant to the Loan Agreement dated as of the date of
this Warrant (the "Loan Agreement") is satisfied on or prior to the date which
falls nine months after the Base Date, this Warrant may not thereafter be
exercised with respect to in excess of 50% of the maximum amount of Warrant
Stock issuable under this Warrant and, in the event that the entire Loan, and
all interest thereon, advanced by the original Holder of this Warrant pursuant
to the Loan Agreement is satisfied on or prior to the date which falls on the
first anniversary of the Base Date, this Warrant may not thereafter be exercised
with respect to in excess of 75% of the maximum amount of Warrant Stock issuable
under this Warrant. For purposes hereof, the "Loan" shall have the meaning set
forth in the Loan Agreement. If this Warrant should be exercised in part only,
the Company shall, upon surrender of this Warrant for cancellation, execute and
deliver a new Warrant evidencing the rights of the Holder thereof to purchase
the balance of the shares purchasable hereunder. Upon receipt by the Company of
this Warrant, together with the Exercise Price, at its office, or by the stock
transfer agent of the Company at its office, in proper form for exercise, the
Holder shall be deemed to be the holder of record of the shares of Common Stock
issuable upon such exercise, notwithstanding that the stock transfer books of
the Company shall then be closed or that certificates representing such shares
of Common Stock shall not then be actually delivered to the Holder. The Company
shall pay any and all documentary stamp or similar issue or transfer taxes
payable in respect of the issue or delivery of shares of Common Stock on
exercise of this Warrant.

                  1.2 CASHLESS EXERCISE. This Warrant may be exchanged, in whole
or in part (subject to the limitations on exercise hereinabove set forth in
Section 1.1) (a "Warrant Exchange"), at any time, or from time to time, during

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the period commencing on the date hereof and ending on the Expiration Date, into
the number of shares of Common Stock determined in accordance with this Section
1.2, by presentation and surrender of this Warrant to the Company at its
principal office, or at the office of its stock transfer agent, if any,
accompanied by a notice (a "Notice of Exchange") stating that this Warrant is
being exchanged and the number of shares of Common Stock to be exchanged. In
connection with any Warrant Exchange, this Warrant shall represent the right to
subscribe for and acquire the number of shares of Common Stock (rounded to the
nearest whole number) equal to (i) the number of shares specified by the Holder
in its Notice of Exchange (the "Total Number") less the number of shares equal
to the quotient obtained by dividing (A) the product of the Total Number and the
then applicable Exercise Price by (B) the then fair market value (determined in
accordance with Section 3 below) per share of Common Stock. If this Warrant
should be exchanged in part only, the Company shall, upon surrender of this
Warrant for cancellation, execute and deliver a new Warrant evidencing the
rights of the Holder thereof to purchase the balance of the shares purchasable
hereunder. Upon receipt by the Company of this Warrant, together with a duly
executed Notice of Exchange, at its office, or by the stock transfer agent of
the Company at its office, the Holder shall be deemed to be the holder of record
of the shares of Common Stock issuable upon such exchange, notwithstanding that
the stock transfer books of the Company shall then be closed or that
certificates representing such shares of Common Stock shall not then be actually
delivered to the Holder. The Company shall pay any and all documentary stamp or
similar issue or transfer taxes payable in respect of the issue or delivery of
shares of Common Stock on exchange of this Warrant.

         2. RESERVATION OF SHARES. The Company will at all times reserve for
issuance and delivery upon exercise of this Warrant all shares of Common Stock
or other shares of capital stock of the Company (and Other Securities) from time
to time receivable upon exercise of this Warrant. All such shares (and Other
Securities) shall be duly authorized and, when issued upon such exercise, shall
be validly issued, fully paid and non-assessable and free of all preemptive
rights.

         3. FRACTIONAL SHARES. No fractional shares or scrip representing
fractional shares shall be issued upon the exercise of this Warrant, but the
Company shall pay the Holder an amount equal to the fair market value of such
fractional share of Common Stock in lieu of each fraction of a share otherwise
called for upon any exercise of this Warrant. For purposes of this Warrant, the
fair market value of a share of Common Stock shall be determined as follows:

                  (a) If the Common Stock is listed on a National Securities
Exchange or admitted to unlisted trading privileges on such exchange or listed
for trading on the NASDAQ system, the current market value shall be the last
reported sale price of the Common Stock on such exchange or system on the last
business day prior to the date of exercise of this Warrant or if no such sale is
made on such day, the average of the closing bid and asked prices for such day
on such exchange or system; or

                  (b) If the Common Stock is not so listed or admitted to
unlisted trading privileges, the current market value shall be the mean of the

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last reported bid and asked prices reported by the National Quotation Bureau,
Inc. on the last business day prior to the date of the exercise of this Warrant;
or

                  (c) If the Common Stock is not so listed or admitted to
unlisted trading privileges and bid and asked prices are not so reported, the
current market value shall be an amount, not less than book value thereof as at
the end of the most recent fiscal year of the Company ending prior to the date
of the exercise of the Warrant, determined by the Board of Directors of the
Company in good faith.

         4. EXCHANGE, TRANSFER, ASSIGNMENT OR LOSS OF WARRANT. This Warrant is
exchangeable, without expense, at the option of the Holder, upon presentation
and surrender hereof to the Company or at the office of its stock transfer
agent, if any, for other Warrants of different denominations, entitling the
Holder or Holders thereof to purchase in the aggregate the same number of shares
of Common Stock purchasable hereunder. Upon surrender of this Warrant to the
Company or at the office of its stock transfer agent, if any, with the
Assignment Form annexed hereto duly executed and funds sufficient to pay any
transfer tax, subject to the provisions of Section 7 hereof, the Company shall,
without charge, execute and deliver a new Warrant in the name of the assignee
named in such instrument of assignment and this Warrant shall promptly be
canceled. This Warrant may be divided or combined with other Warrants that carry
the same rights upon presentation hereof at the office of the Company or at the
office of its stock transfer agent, if any, together with a written notice
specifying the names and denominations in which new Warrants are to be issued
and signed by the Holder hereof.

         5. RIGHTS OF THE HOLDER. The Holder shall not, by virtue hereof, be
entitled to any rights of a shareholder in the Company, either at law or in
equity, and the rights of the Holder are limited to those expressed in this
Warrant.

         6.       ANTI-DILUTION PROVISIONS.

                  6.1 ADJUSTMENT FOR RECAPITALIZATION. If the Company shall at
any time subdivide its outstanding shares of Common Stock (or Other Securities
at the time receivable upon the exercise of the Warrant) by recapitalization,
reclassification or split-up thereof, or if the Company shall declare a stock
dividend or distribute shares of Common Stock to its shareholders, the number of
shares of Common Stock subject to this Warrant immediately prior to such
subdivision shall be proportionately increased and the Exercise Price shall be
proportionately decreased, and if the Company shall at any time combine the
outstanding shares of Common Stock by recapitalization, reclassification or
combination thereof, the number of shares of Common Stock or Other Securities
subject to this Warrant immediately prior to such combination shall be
proportionately decreased and the Exercise Price shall be proportionately
increased. Any such adjustments pursuant to this Section 6.1 shall be effective
at the close of business on the effective date of such subdivision or
combination or if any adjustment is the result of a stock dividend or
distribution then the effective date for such adjustment based thereon shall be
the record date therefor.

                  6.2 ADJUSTMENT FOR REORGANIZATION, CONSOLIDATION, MERGER, ETC.
In case of any reorganization of the Company (or any other entity, the
securities of which are at the time receivable on the exercise of this Warrant)

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after the Base Date or in case after such date the Company (or any such other
entity) shall consolidate with or merge into another entity or convey all or
substantially all of its assets to another entity, then, and in each such case,
the Holder of this Warrant upon the exercise thereof as provided in Section 1 at
any time after the consummation of such reorganization, consolidation, merger or
conveyance, shall be entitled to receive, in lieu of the securities and property
receivable upon the exercise of this Warrant prior to such consummation, the
securities or property to which such Holder would have been entitled upon such
consummation if such Holder had exercised this Warrant immediately prior
thereto; in each such case, the terms of this Warrant shall be applicable to the
securities or property receivable upon the exercise of this Warrant after such
consummation.

                  6.3      NO DILUTION.

                           (a) From the date of issuance of this Warrant until
the later of (1) the first anniversary date of such issuance and (2) the date on
which the Company first consummates a sale of shares of its equity securities
(within the meaning of Section 3(a)(11) of the Securities Exchange Act of 1934,
as amended) or debt securities convertible into equity securities for gross cash
proceeds to the Company of more than $2.0 million (such period through such
later date, hereinafter referred to as the "Reset Period") other than Excluded
Shares (as hereinafter defined), if the Company shall issue or enter into any
agreement to issue any shares of Common Stock other than Excluded Shares for
consideration per share (the "Issuance Price") less than the Exercise Price per
share in effect immediately prior to such issuance, the Exercise Price in effect
immediately prior to such issuance shall be reduced (but shall not be increased)
to the Issuance Price. For purposes hereof, the term "Excluded Shares" shall
mean (1) any shares of Common Stock issued in a transaction described in
Sections 6.1 and 6.2 of this Warrant; (2) issuances of shares of Common Stock
from time to time pursuant to employment agreements, stock option or bonus plans
authorized by the Board of Directors of the Corporation as of the date hereof,
(3) issuances of Common Stock, or options to acquire shares of Common Stock, or
securities convertible into or exchangeable for Common Stock pursuant to the
terms of any acquisition by the Company of all or substantially all of the
operating assets, or more than fifty percent (50%) of the voting capital stock
or other controlling interest of any business entity in a transaction negotiated
on an arms-length basis and expressly approved in advance by the Board of
Directors of the Company; (4) issuances of shares of Common Stock from time to
time upon the exercise, exchange or conversion of warrants, options, convertible
securities, the Company's outstanding 8 1/4% Subordinated Convertible Notes Due
2003 or other securities outstanding as of the date hereof and pursuant to the
written terms of such securities as they exist as of the date hereof, and (5)
issuances of shares of Common Stock from time to time pursuant to the
anti-dilution provisions of other securities of the Company, including shares of
the Company's outstanding Series B, Series C and Series D Convertible Preferred
Stock. For purposes hereof, "voting capital stock" shall be deemed to be capital
stock of any class or classes, however designated having ordinary voting power
for the election of members of the board of directors or other governing body
and "controlling" shall mean the possession, directly or indirectly, of the
power to direct or cause the direction of the management and policies of a
party, whether through the ownership of voting capital stock, by contract or
otherwise.

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                           (b) If, at any time from the date of issuance of this
Warrant, the Company shall issue or enter into any agreement to issue any shares
of Common Stock other than Excluded Shares for consideration per share lower
than the market price per share in effect immediately prior to such issuance,
the Exercise Price in effect immediately prior to such issuance shall be reduced
(but shall not be increased) to the price (calculated to the nearest cent)
determined by multiplying the Exercise Price in effect immediately prior to such
issuance by the factor determined by dividing (1) an amount equal to the sum of
(A) the number of shares of Common Stock outstanding on a fully diluted basis
immediately prior to such issuance multiplied by the market price per share in
effect immediately prior to such issuance and (B) the consideration, if any,
received by the Company upon such issuance by (2) the number of shares of Common
Stock outstanding on a fully diluted basis immediately after such issuance
multiplied by the market price per share in effect immediately prior to such
issuance; provided, however, no adjustment shall be made to the Exercise Price
if (1) such issuance is in connection with a firm commitment underwritten public
offering or (2) the consideration per share is equal to or greater than 85% of
the market price per share in effect immediately prior to such issuance. For
purposes hereof, the "market price" as of any measurement date shall be the
average of the closing prices of the Common Stock for each of the 10 consecutive
trading days immediately preceding such measurement date.

                           (c) The Company will not, by amendment of its
Articles of Incorporation or through reorganization, consolidation, merger,
dissolution, issue or sale of securities, sale of assets or any other voluntary
action, avoid or seek to avoid the observance or performance of any of the terms
of this Warrant, but will at all times in good faith assist in the carrying out
of all such terms and in the taking of all such action as may be necessary or
appropriate in order to protect the rights of the Holder of this Warrant against
dilution or other impairment.

                           (d) For further clarity, any change to the exercise
price or other terms of the 8-1/4% Subordinated Convertible Notes Due 2003 shall
not count to determining the Reset Period, but shall be taken into account in
determining whether any adjustment to the Exercise Price is due under this
Section 6.3.

                           (e) The Exercise Price shall be subject to adjustment
from time to time as previously provided in this section 6.3. Upon each
adjustment of the Exercise Price, the holder of the Warrant evidenced hereby
shall thereafter be entitled to purchase, at the Exercise Price resulting from
such adjustment, the number of shares of Common Stock (calculated to the nearest
whole share pursuant to Section 3) obtained by multiplying the Exercise Price in
effect immediately prior to such adjustment by the number of shares purchasable
pursuant hereto immediately prior to such adjustment and dividing the product by
the Exercise Price resulting from such adjustment.

                  6.4 CERTIFICATE AS TO ADJUSTMENTS. In each case of an
adjustment in the number of shares of Warrant Stock or Other Securities
receivable on the exercise of this Warrant, or the Exercise Price, the Company
at its expense will promptly compute such adjustment in accordance with the

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terms of this Warrant and prepare a certificate executed by an executive officer
of the Company setting forth such adjustment and showing in detail the facts
upon which such adjustment is based. The Company will forthwith mail a copy of
each such certificate to the Holder.

                  6.5      NOTICES OF RECORD DATE, ETC.  In case:

                  (a) the Company shall take a record of the holders of its
Common Stock (or Other Securities at the time receivable upon the exercise of
the Warrant) for the purpose of entitling them to receive any dividend (other
than a cash dividend at the same rate as the rate of the last cash dividend
theretofore paid) or other distribution, or any right to subscribe for, purchase
or otherwise acquire any shares of stock of any class or any other securities,
or to receive any other right; or

                  (b) of any capital reorganization of the Company, any
reclassification of the capital stock of the Company, any consolidation or
merger of the Company with or into another entity, or any conveyance of all or
substantially all of the assets of the Company to another entity; or

                  (c) of any voluntary or involuntary dissolution, liquidation,
partial liquidation or winding up of the Company, or

                  (d) any event resulting in the expiration of the Reset Period,
then, and in each such case, the Company shall mail or cause to be mailed to
each Holder of the Warrant at the time outstanding a notice specifying, as the
case may be, (i) the date on which a record is to be taken for the purpose of
such dividend, distribution or right, and stating the amount and character of
such dividend, distribution or right, or (ii) the date on which such
reorganization, reclassification, consolidation, merger, conveyance,
dissolution, liquidation or winding up is to take place, and the time, if any,
to be fixed, as to which the holders of record of Common Stock (or such other
securities at the time receivable upon the exercise of the Warrant) shall be
entitled to exchange their shares of Common Stock (or such other securities) for
securities or other property deliverable upon such reorganization,
reclassification, consolidation, merger, conveyance, dissolution, liquidation or
winding up. Such notice shall be mailed at least 20 days prior to the date
therein specified.

         7. TRANSFER TO COMPLY WITH THE SECURITIES ACT. Notwithstanding any
other provision contained herein, this Warrant and any Warrant Stock or Other
Securities may not be sold, transferred, pledged, hypothecated or otherwise
disposed of except as follows: (a) to a person who, in the opinion of counsel to
the Company, is a person to whom this Warrant or the Warrant Stock or Other
Securities may legally be transferred without registration and without the
delivery of a current prospectus under the Securities Act with respect thereto;
or (b) to any person upon delivery of a prospectus then meeting the requirements
of the Securities Act relating to such securities and the offering thereof for
such sale or disposition, and thereafter to all successive assignees.

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         8. LEGEND. Unless the shares of Warrant Stock or Other Securities have
been registered under the Securities Act, upon exercise of any of the Warrants
and the issuance of any of the shares of Warrant Stock or Other Securities, all
certificates representing such securities shall bear on the face thereof
substantially the following legend:

                  The securities represented by this certificate have not been
                  registered under the Securities Act of 1933, as amended, and
                  may not be sold, offered for sale, assigned, transferred or
                  otherwise disposed of, unless registered pursuant to the
                  provisions of that Act or unless an opinion of counsel is
                  obtained stating that such disposition is in compliance with
                  an available exemption from such registration.

         9. NOTICES. All notices required hereunder shall be in writing and
shall be deemed given when telegraphed, delivered personally or within two days
after mailing when mailed by certified or registered mail, return receipt
requested, to the Company at its principal office, or to the Holder at the
address set forth on the record books of the Company, or at such other address
of which the Company or the Holder has been advised by notice hereunder.

         10. APPLICABLE LAW. The Warrant is issued under and shall for all
purposes be governed by and construed in accordance with the laws of the State
of Florida, without giving effect to the choice of law rules thereof.

         IN WITNESS HEREOF, the Company has caused this Warrant to be signed on
its behalf, in its corporate name, by its duly authorized officer, all as of the
day and year first above written.

                                     SYSTEMONE TECHNOLOGIES INC.

                                     By: /s/ Paul Mansur
                                        ---------------------------------
                                     Name:  Paul Mansur
                                     Title: Chief Executive Officer

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                              WARRANT EXERCISE FORM

The undersigned hereby irrevocably elects to exercise the within Warrant to the
extent of purchasing ____________ shares of Common Stock of SystemOne
Technologies Inc., a Florida corporation, and hereby makes payment of
$____________ in payment therefor.

                                      ----------------------------------------
                                      Signature

                                      ----------------------------------------
                                      Signature, if jointly held

                                      ----------------------------------------
                                      Date

                       INSTRUCTIONS FOR ISSUANCE OF STOCK
         (if other than to the registered holder of the within Warrant)

Name
    ----------------------------------------------------------------------------
                        (Please typewrite or print in block letters)

Address
    ----------------------------------------------------------------------------

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

Social Security or
Taxpayer Identification Number

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

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                                 ASSIGNMENT FORM

FOR VALUE RECEIVED,
                   ------------------------------------------------------------
hereby sells, assigns and transfers unto

Name
    ----------------------------------------------------------------------------
                     (Please typewrite or print in block letters)

the right to purchase Common Stock of SystemOne Technologies Inc., a Florida
corporation, represented by this Warrant to the extent of shares as to which
such right is exercisable and does hereby irrevocably constitute and appoint
___________________________________________ Attorney, to transfer the same on
the books of the Company with full power of substitution in the premises.

DATED:  ____________, 200_.

                                               --------------------------------
                                               Signature

                                               --------------------------------
                                               Signature, if jointly held

                                      -10-<PAGE>   1

                       FIRST AMENDMENT TO RIGHTS AGREEMENT

         THIS FIRST AMENDMENT TO RIGHTS AGREEMENT (this "Amendment") is made as
of the 2nd day of May, 2000, by and between MANSUR INDUSTRIES INC., a Florida
corporation (the "Company"), and CONTINENTAL STOCK TRANSFER & TRUST COMPANY (the
"Rights Agent").

                                    RECITALS

         WHEREAS, on October 1, 1998, the Board of Directors of the Company
authorized and declared a dividend distribution of one Right for each share of
common stock, $.001 par value, of the Company outstanding at the close of
business on October 8, 1998; and

         WHEREAS, the Company and the Rights Agent entered into a certain Rights
Agreement, dated as of October 1, 1998 (the "Rights Agreement"), providing,
among other things, for the issuance of the Rights (all capitalized terms used
in this Amendment and not otherwise defined herein shall have the meanings
ascribed to such terms in the Rights Agreement); and

         WHEREAS, the Board of Directors of the Company has approved the
amendment of the Rights Agreement as hereinafter set forth, pursuant to a
unanimous written consent dated as of May 2, 2000;

         NOW, THEREFORE, in consideration of the premises and for other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

         1. Section 1 of the Rights Agreement is hereby amended by deleting the
definition of "Acquiring Person" set forth in subsection (a) thereof in its
entirety and substituting therefor a new definition of "Acquiring Person" to
read as follows:

                  "'Acquiring Person' shall mean any Person who or which,
         together with all Affiliates and Associates of such Person, shall be
         the Beneficial Owner of fifteen percent (15%) or more of the shares of
         Common Stock the outstanding. Notwithstanding the foregoing, the term
         "Acquiring Person" shall not include (i) the Company, any Subsidiary of
         the Company, any employee benefit plan of the Company or of any
         Subsidiary of the Company, or any Person or entity organized, appointed
         or established by the Company for or pursuant to the terms of any such
         plan, (ii) Pierre G. Mansur, unless such individual shall be the
         beneficial owner of fifty percent (50%) or more of the share of Common
         Stock then outstanding, (iii) Hanseatic Americas LDC, unless it shall
         be the beneficial owner of thirty-three percent (33%) or more of the
         shares of Common Stock then outstanding, (iv) Environmental
         Opportunities Fund II (Institutional), L.P., Environmental
         Opportunities Fund II, L.P., Environmental

<PAGE>   2

         Opportunities Fund, L.P., or Environmental Opportunities Fund II
         (Cayman), L.P., unless such Persons shall be the Beneficial Owners,
         individually or in the aggregate, of twenty-eight percent (28%) or more
         of the shares of Common Stock then outstanding, or (v) any Person who
         or which, together with all Affiliates and Associates of such Person,
         would be an Acquiring Person solely by reason of a reduction in the
         number of issued and outstanding shares of Common Stock of the Company
         pursuant to a transaction or series of related transactions approved by
         a majority of the Independent Directors, if any, then in office and
         approved by a Supermajority Vote; provided, further, however, that in
         the event that such Person described in the foregoing clause (v) does
         not become an Acquiring Person by reason of the foregoing clause (v),
         such Person shall nonetheless become an Acquiring Person in the event
         such Person thereafter acquires Beneficial Ownership of an additional
         one percent (1%) of the Common Stock of the Company, unless such
         additional Common Stock ownership results solely from a subsequent
         reduction in the number of issued and outstanding shares of Common
         Stock of the Company."

         2. Except as specifically amended hereby, the Rights Agreement is and
remains unmodified and in full force and effect and is hereby ratified and
confirmed.

         3. This Amendment shall be deemed a contract made under the laws of the
State of Florida and for all purposes shall be governed by and construed in
accordance with the laws of such State applicable to contracts made and to be
performed entirely within such State.

         4. This Amendment may be executed in counterparts and both of such
counterparts shall for all purposes be deemed to be an original, and such
counterparts shall constitute but one and the same instrument.

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed as of the date first above written.

                                       2
<PAGE>   3

                                             MANSUR INDUSTRIES INC.

                                             By: /s/ PAUL MANSUR
                                                 -------------------

                                             CONTINENTAL STOCK TRANSFER &
                                             TRUST COMPANY

                                             By: /s/ ROGER BERNHAMMER
                                                 ----------------------

                                        3

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