WNYBob wrote:
IMO Fiberglass is not worth it, unless the backer is NOT WOOD. Yes most "fiberglas" RV's have wood as a backer. Even high humidity or a very minor moisture penitration can cause "Delamination". If this happens you loose THOUSANDS in resale value.
Look for Azdel or similar non wood backers.
I could not have said it better ! Azdel is the only "backer" that does NOT contain wood/wood fibers or other material that will rot. Only a couple of RV companies use it
(Coachman for one) and it is NOT used in all exterior surfaces.