Question: What brand of wax is best for a fiberglass RV?
Answer: The product we use on our fiberglass motorhome is not actually a wax; it is a U.V. protectant called 303 Aerospace Protectant. We use this U.V. protectant on everything (fiberglass, roof, tires, trim) to protect against the constant exposure to the sun. We don’t bother with wax. We buy 303 by the gallon.
We have been using it since we first got the motorhome and swear by it for the protection and shine. We try to do a 303 treatment at least 2 times a year, after completely washing the RV. We have received compliments on how nice our RV looks, and anyone we’ve met who also uses 303 gives it a big thumbs up.