The Marine Plywood is fully waterproof plywood, that has been manufactured for marine applications. This type of board is used used for building boats & ships, and various other applications in which the plywood is definitely to get a large amount of exposure to water. In addition, the Marine Plywood is much stronger than Commercial grade plywood due to the superior wood & glues used in its manufacture. What makes it different is its unique features like, it is completely resistant to termites, marine borers, fungi and other wood destroying organisms.