Marine grade has no special waterproofing in or on the wood, unless it has been added as a special feature. If you don't get the wood wet very often and if it's sealed, as you state, there's no ...

Supersede, headquartered in Phoenix, recently launched what it claims is the world’s first 1:1 marine-grade plywood replacement. Supersede Marine Board is an engineered extruded sheet crafted from ...