For What It's Worth...
Originally Posted by flashover52
It was actually gooey before I sanded and it gummed up on the belt. Was running 80 grit. Not sure if a handheld planer (which I don’t have) would work or running a router with a wide cutting bit a fraction of an inch down would work or gum up the blades. It’s one of those points in the project when you start questioning why did I start this!?!?
I haven’t used epoxy fiberglass before so I’m assuming this would not be a good base to start with....
I would use that piece of plywood as an excellent template for the new piece you could easily install. Whatever you decide to do it might be best to finish the reverse side of the new ply with something to keep the water out.
When I redo drift boat decks I like to use Herculiner (bed liner for trucks). A quart would finish both sides and give you an excellent traction surface that is waterproof. Scuff up the DRY plywood with that sander and the stuff will never come off. The only downside I've found with this product is that it will gray over time. It applies with a roller and is a very servicable product for this particular use.