Marine plywood is waterproof. The plywood uses exterior glue to tolerate wet and humid conditions. Marine plywood is generally covered with tough wood veneer to endure moisture for a long time. Exterior and aircraft plywood are also waterproof.
Marine plywood can fight off a fungal attack, and it is common in the construction of boats and decks. The plywood is more expensive than other grades.
Exterior plywood uses strong glues that resist moisture. The plywood is easy to find and is good for exterior and interior purposes. Aircraft plywood is made of mahogany and uses core adhesives to weather moisture and heat.