house paint on plywood skin

The plans for the wonderer campers don't say how to seal the wood. I know fiberglass is one way but will caulking the seams then using house paint work to protect the wood.
also I have a lot of fabric left from my plane project that I could use to cover it with use that as a PMF
also I have a lot of fabric left from my plane project that I could use to cover it with use that as a PMF