After many years outdoors, an RV’s fiberglass outer skin will inevitably start to look a little bit faded. As it ages, fiberglass oxidizes and loses its gloss, regardless of waxing.
Fortunately, the fiberglass used in boat hulls doesn’t differ much from that used on motorhomes, so fiberglass-restoration products designed for the nautical industry work just as well on land-based vehicles.
Products like PoliGlow and NewGlass2 can bring the shine back to an older RV. The process is similar to varnishing a floor and the primary ingredient is elbow grease.