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        Q: What is the difference between marine grade plywood and treated and will paint stick to treated plywood?
A: Marine plywood is made with full layers of veneer , put combined with water proof glue . Treated plywood has voids in the veneer layers and regular glue utilized , , it are dealt with to stop disintegration . Also marine plywood costs 2 to 3 times more..It is feasible to ordered in any length you want but costs goes up . In 1967 a 3/8 '' x 4'x20 ' Fir marine plywood costs $ 78.00 per sheet . 

Q: Waterproofing plywood?
A: No plywood is waterproof but they do make weather resilient plywood called marine board .