After I purchased my 1988 Seaswirl Sable I found out the deck was rotten under the fiberglass. I removed all rot and replaced the deck with 3/4" marine plywood so now it is removable and I have access to the furl tanl, bildge etc. I a have 1/4" or less gap between pieces of the plywood which I would like to fill with a marine sealer which can be painted and removed and reapplied after accessing the bildge area. I was looking for something similiar to what my friend has on his Grady White between the access decks. Does anyone have a sealer that you would recommend?