plywood choices for floor and transom

[Kracker Jack]

Do you necessarly need to use a marine grade? I have heard some things you can do to a standard plywoods instead of using marine grade. Can I get some positives and negatives on all different applications. Thanks in advance

[Kracker Jack]

can i get some positives and negatives on different types of plywood and techniques for prepping non-treated

[Kracker Jack]

Hedge i read a thread on here on "hot coating" a b/c type ply. By rolling on non hardened resin let it sit over night then roll on a hardened resin then sand and apply. by hardened I mean mixed and non mixed. Im not trying to cut corners im just looking at about 15 sheets of 3/4 birch cabinet grade that was made and china and is far from finish grade that was given to me.

[baconaneggs]

As a builder, I have used some of the Chinese 3/4 birch. It is much less expensive than the the US version carried by my lumber yard. The first time I used it was on a study/office renovation. We built up numerous built in cabinets and proceded to prime them in place after installation. You can imagine my delight when the vaneer began to delaminate and wrinkle after application of a oil based primer. We have used latex primer on the good stuff and have never had any problems I think I saved about 400 on the job. I figured I lost about 3000. I would strongly recomend you buy a marine plywood to do any repairs. A house is only as good as it's foundation. Why skimp on your boat. And he is right, treated pw is very wet and takes forever to dry. when it does, it looks like a potato chip! Or a taco.

[Kracker Jack]

baconaneggs same here with this ply!!thin veneer!!! I just figured it would be a little different using a resin and hardener on it rather than your issue using a latex or "water base" paint. once again not trying to cut corners. There are alot of threads on here were guys are using 3/4 untreated plys in fully encapsulated situations such as transoms and floors. im just trying to get every ones opinions. Is marine ply treated? or is it just the quality of glues they use to laminate the plywood that makes it marine grade?

[jeffmo]

every time i have used plywood on one of my boats i used marine grade.after cutting the pieces to whatever size i needed i would apply a couple of coats of helmsman spar for added protection.