My class C is 5 years old and has 90K miles on it, and it is parked outside with a lot of trees by the driveway. I've kept it clean and have waxed it once or twice a year, but the front cap was getting badly oxidized, especially the upper part of it. It looked chalky white and even had some mold growing on the very upper part of it.
Based on this thread, I decided to try the Meguiar's Marine/RV products. They sell a restoration kit that has #59 Oxidation Remover, #45 High Gloss Polish, and #56 Pure Wax. On the heavily oxidized parts I used a random orbit polisher for the oxidation remover and polish, then applied the wax by hand. On other parts of the RV that weren't so oxidized I skipped the oxidation remover, and on some areas that still looked pretty good I only did the wax.
The results were good, as you can see in the photos. For its age and mileage it still looks pretty good. I wish I had taken some before photos so you could see the difference.
I'll have to wait and see how long the results last. I'm not convinced that the Pure Wax is going to last a long time, but I'll give it a chance. I tried ceramic polish in the past thinking it would last a lot longer, but it didn't. I had some Jetseal 109 that I tried a few years ago, and so far that has been the longest lasting product I've tried.
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