Exhibit 99.1 Marine Products Corporation Announces First Quarter Cash Dividend ATLANTA, April 28 /PRNewswire-FirstCall/ -- The Marine Products Corporation (Amex: MPX) Board of Directors declared a regular quarterly cash dividend of $0.04 per share payable June 10, 2004 to common shareholders of record at the close of business May 10, 2004. 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 www.marineproductscorp.com . For information contact: BEN M. PALMER JIM LANDERS Chief Financial Officer Corporate Finance 404.321.7910 404.321.2162 irdept@marineproductscorp.com SOURCE Marine Products Corporation -0- 04/28/2004 /CONTACT: Ben M. Palmer, Chief Financial Officer, +1-404-321-7910, or irdept@marineproductscorp.com, or Jim Landers, Corporate Finance, +1-404-321-2162, both of Marine Products Corporation/ /Web site: http://www.marineproductscorp.com / (MPX) CO: Marine Products Corporation ST: Georgia IN: MAR SU: DIV