First Post – and let me clarify I’m not an expert. I am replacing my fiberglass cracking no longer encapsulated rotted plywood floor. Here’s what I’m doing: I bought marine plywood $88 sheet 3/4″ – I’m using 100% solids epoxy coating then covering with Durabak coating. I have 2 seams that I’m connecting with stainless steel pockets screws and using a splice plate with spare plywood for strength.
Plywood wasn’t cheap nor was the Durabak coating ($100+ gallon). After both side are sealed and coated I’m going to glue to top of remaining fiberglass flooring with 3M 5200 adhesive. – I hope this works. It was nice reading through this thread.