Exhibit 99 [LOGO] MARINE PRODUCTS CORPORATION FOR IMMEDIATE RELEASE MARINE PRODUCTS CORPORATION COMMENTS ON UNUSUAL TRADING ACTIVITY ATLANTA, December 22, 2004 -- Marine Products Corporation (AMEX: MPX) commented today on unusual trading activity in its common stock. The trading volume of Marine Products Corporation's stock was approximately 168,000 shares today and the closing price was $24.07, a decline of $3.18 or 11.7% from the previous day's closing price. The Company stated that there has been no material development in its business and affairs not previously disclosed publicly, or to its knowledge, any other reason to account for the unusual market activity. Marine Products is a leading manufacturer of fiberglass boats, including Chaparral pleasure boats and Robalo sport fishing boats. Marine Products Corporation's investor Web site can be found on the Internet at http://www.marineproductscorp.com. For information about Marine Products Corporation please contact: BEN M. PALMER Chief Financial Officer 404.321.7910 irdept@marineproductscorp.com JIM LANDERS Corporate Finance 404.321.2162