I have a 2019 Redhawk class C. We camp a lot. Turning yellow is inevitable. When not in use I cover mine while in storage half the year, while in florida, the other half it is in an indoor storage facility up north. I have the RV waxed with a hand rubbed wax once a year and polish the front cap with NUfinish polish twice a year with an electric orbital polisher. Having said that, 3 years ago I had to have my front cap repainted after the two-year warranty was up! Gelcoat was starting to strip off the front, Imagine that!. I had it repainted with urethane paint, the same paint they use on airplanes. it looks fantastic! Redid all the factory decals too. Was expensive but well worth it. Makes the RV look like brand new!