Marine plywood is a type of high-quality plywood that is specifically designed for use in humid and damp environments. It is made from waterproof glue and has a higher number of plies than regular plywood, making it stronger and more durable. Laminated marine plywood is a variation of marine plywood where the plies are bonded together with a waterproof adhesive, making it even more resistant to water damage. The price of marine plywood depends on the thickness, size and quality of the plywood. On average, it is more expensive than regular plywood due to its superior durability and water resistance. Laminated marine plywood is generally more expensive than regular marine plywood, but it provides added protection against water damage and is ideal for use in boats, docks, and other marine applications.