MARINE PRODUCTS CORPORATION AND SUBSIDIARIES EXHIBIT 32.1 MARINE PRODUCTS CORPORATION Form 10-Q - Quarter Ended September 30, 2003 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 I, Richard A. Hubbell, certify that, to the best of my knowledge: The Form 10-Q of Marine Products Corporation, for the period ended September 30, 2003 fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934; and The information contained in such report fairly presents, in all material respects, the financial condition and results of operations of Marine Products Corporation for the periods presented. /s/ Richard A. Hubbell ---------------------- Date: October 31, 2003 Richard A. Hubbell President and Chief Executive Officer (Principal Executive Officer)