Okoume Marine Plywood. Okoume marine grade plywood is considered perhaps the finest construction plywood available for boats, and is certified to British Standard 1088. Used by hobbyists and some of the world's largest boat builders. Most often used in combination with epoxy and fiberglass creating a structure that can be stronger and lighter than plastic or fiberglass, rivaling the performance of more advanced composites such as carbon fiber. The grain appearance is prized, likened to that of mahogany and is often varnished for a decorative appearance. 4MM 4' X 2'.