<PAGE>

                               AMISTAR CORPORATION

                                  EXHIBIT 99.2

                                 CERTIFICATIONS

I, Stuart C. Baker, certify that:

1)   I have reviewed this quarterly report on Form 10-Q for the quarter ended
     September 30, 2002;

2)   To the best of my knowledge, this quarterly report does not contain any
     untrue statements of a material fact or omit to state a material fact
     necessary to make the statements made, in light of the circumstances under
     which such statements were made, not misleading with respect to the period
     covered by this quarterly report;

3)   To the best of my knowledge, the financial statements, and other financial
     information included in this quarterly report, fairly present in all
     material respects the financial condition, results of operations and cash
     flows of Amistar Corporation as of, and for, the periods presented in this
     quarterly report;

4)   The registrant's other certifying officer and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-14 and 15d-14) for the registrant and have to the
     best of my knowledge:
     a)   Designed such disclosure controls and procedures to ensure that
          material information relating to the Company, is made known to us.
     b)   Evaluated the effectiveness of the registrant's disclosure controls
          and procedures as of a date within 90 days prior to the filing date of
          this quarterly report (the "Evaluation Date"); and
     c)   Presented in this quarterly report our conclusions about the
          effectiveness of the disclosure controls and procedures based on our
          evaluation as of the Evaluation Date; and

5)   The registrant's other certifying officer and I have disclosed, based on
     our most recent evaluation, to the registrant's auditors and the audit
     committee of Amistar Corporation's Board of Directors to the best of my
     knowledge:
     a)   All significant deficiencies in the design or operation of internal
          disclosure controls which could adversely affect the registrant's
          ability to record, process, summarize and report financial data and
          have identified for the registrant's auditors any material weaknesses
          in internal controls; and
     b)   Any fraud, whether or not material, that involves management or other
          employees who have a significant role in the registrant's internal
          controls;

6)   The registrant's other certifying officer and I have indicated in this
     quarterly report whether or not there were significant changes in internal
     disclosure controls or in other factors that could significantly affect
     internal disclosure controls subsequent to the date of our most recent
     evaluation, including any corrective actions with regard to significant
     deficiencies and material weaknesses.


                                                  By: /s/ Stuart C. Baker
                                                      --------------------------
                                                  Name: Stuart C. Baker
                                                  Title: Chief Executive Officer

<PAGE>

                               AMISTAR CORPORATION


I, Gregory D. Leiser, certify that:

1)   I have reviewed this quarterly report on Form 10-Q for the quarter ended
     September 30, 2002;

2)   To the best of my knowledge, this quarterly report does not contain any
     untrue statements of a material fact or omit to state a material fact
     necessary to make the statements made, in light of the circumstances under
     which such statements were made, not misleading with respect to the period
     covered by this quarterly report;

3)   To the best of my knowledge, the financial statements, and other financial
     information included in this quarterly report, fairly present in all
     material respects the financial condition, results of operations and cash
     flows of Amistar Corporation as of, and for, the periods presented in this
     quarterly report;

4)   The registrant's other certifying officer and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13a-14 and 15d-14) for the registrant and have to the
     best of my knowledge:
     a)   Designed such disclosure controls and procedures to ensure that
          material information relating to the Company, is made known to us.
     b)   Evaluated the effectiveness of the registrant's disclosure controls
          and procedures as of a date within 90 days prior to the filing date of
          this quarterly report (the "Evaluation Date"); and
     c)   Presented in this quarterly report our conclusions about the
          effectiveness of the disclosure controls and procedures based on our
          evaluation as of the Evaluation Date; and

5)   The registrant's other certifying officer and I have disclosed, based on
     our most recent evaluation, to the registrant's auditors and the audit
     committee of Amistar Corporation's Board of Directors to the best of my
     knowledge:
     a)   All significant deficiencies in the design or operation of internal
          disclosure controls which could adversely affect the registrant's
          ability to record, process, summarize and report financial data and
          have identified for the registrant's auditors any material weaknesses
          in internal controls; and
     b)   Any fraud, whether or not material, that involves management or other
          employees who have a significant role in the registrant's internal
          controls;

6)   The registrant's other certifying officer and I have indicated in this
     quarterly report whether or not there were significant changes in internal
     disclosure controls or in other factors that could significantly affect
     internal disclosure controls subsequent to the date of our most recent
     evaluation, including any corrective actions with regard to significant
     deficiencies and material weaknesses.



                                                  By: /s/ Gregory D. Leiser
                                                      --------------------------
                                                  Name: Gregory D. Leiser
                                                  Title: Chief Financial Officer