I do mine twice a year, using Protect-All (a synthetic, not carnuba). This one is painted, but the previous one was fiberglass with decals, like yours. Seems to do fine in the Florida sun and elsewhere.With regular polishing, yout coach should stay great looking for years, except for the decals. Not much can help them - they dry out and fade in the sun after several years. Getting wax on them can actually be counter-productive.