i have an auto trail apache with the external flap shelf thingy at the back wher spare wheel inside this , the edge of the woode floor bit that points to the back is bare along the edging would it be best to under seal/paint this
AutoTrail evidently didn't know either so they just left it natural. We sealed plywood on boats using thin epoxy resin. This soaks in and hardens protecting the wood. Done from both sides the wood was impervious to water.