I am refurbishing a 1977 dodge Bonanza. I want to completely re do the exterior walls. I was thinking of using 1/8" lass b FRP sheets over a 1/4" layer of plywood. The reason I wanted to do this was to update the exterior, make easy to keep clean and is cost effective. I've noticed class a uv gel coated sheets is the way to go but is not cost effective. I want to know is there a way to use the class B and the add a UV gel coat to the FRP to prevent fading or is there other some "cost effective way to refinish the exterior of an old RV?