EXHIBIT 99.1

                         CERTIFICATION PURSUANT TO
                          18 U.S.C. SECTION 1350,
                          AS ADOPTED PURSUANT TO
               SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant  to  Section 906 of the Sarbanes-Oxley Act of 2002,  each  of  the
undersigned  certifies that this periodic report fully  complies  with  the
requirements  of Section 13(a) or 15(d), as applicable, of  the  Securities
Exchange  Act of 1934 and that the information contained in this  quarterly
report  on  Form  10-Q  fairly  presents, in  all  material  respects,  the
financial condition and results of operations of Spartech Corporation.


                                        Date: June 10, 2003


                                        /s/Bradley B. Buechler
                                        Bradley B. Buechler
                                        Chairman, President and Chief
                                        Executive Officer


                                        /s/Randy C. Martin
                                        Randy C. Martin
                                        Executive Vice President and  Chief
                                        Financial Officer


A signed original of this written statement required by Section 906 has
been provided to Spartech Corporation and will be retained by Spartech
Corporation and furnished to the Securities and Exchange Commission or its
staff upon request.