Sealing Marine Ply Decking
I'm new to this forum and have searched and read posts related to sealing marine plywood. But I have not been able to find a definative answer to my question. If somone knows of a link to a thread then please advise. I know forum members, at least on other forums, detest someone wanting handholding without searching/reading on there own first.
I am in the process of replacing the deck on a 20' pontoon boat. I will be using 3/4 marine ply. $95.00 a sheet at my supplier is case anyone is interested. The deck will be covered on the topside with marine carpet and it will be stored outside year round. At the dock during summer months and in the yard during cold weather. I am anal about maintaining my stuff. So, the boat will be covered at all times when not in use. Snap on canvas cover during summer, tarped during winter. I plan on keeping this boat for a long time and would like this to be the only time that I need to replace the deck if possible. But I may need to replace the carpet at some time in the future. When I tried to remove the carpet on the deck currently I pulled up most of the top layer of ply. The deck that's on there now is nine years old, but the last owner did a poor job of keeping it covered at all. So, now that you know the background, here are my questions.
Should the ply be sealed with epoxy and cloth? I have read several posts that state you cannot completly seal plywood and it will eventually get a breach. Then the applied epoxy and cloth with act to hold in the moisture instead of keeping it out.
If it should be sealed, with this allow for easier removal of the carpet in the future should it be required?
Should all sides, edges, fastener holes, and other holes (control cables, etc.) be sealed? Or, should I leave the underside unsealed so it can "breath"?
What product/s should be used to seal.
I would be greatfull for any help and ideas. Thanks in advance for your help.