On our Keystone Outback, the front cap started fading after one year. Just out of the one year warranty. I debated the issue with my dealership, who went to bat for us and Keystone agreed to do a repaint. But, because the graphics were not damaged, they did not fall under warranty. I had to pay for new graphic replacement, but Keystone covered the cost for the repaint.
Repainting and new gelcoat is the only true answer. Don't spend your money on anything less, you'll just be wasting your money, and still have to do it again, and maybe again, and again.
Ours was taken to an automotive shop that had a speciality repainting RV. They did a fantastic job on the front cap, looked BETTER than when it was new, and it retained it's luster and shine until we traded for our current fifth wheel.
Again, you can try buffing, shining, different treatments, coating, pampering, and even changing diapers, but lipstick on a pig doesn't change the pig. It just makes the pig look ridiculous. It's not cheap, so you have to weigh the issue, is it worth it to you for the length of time you plan on keeping the camp[er? Repainting will add absolutely no value to the resale. Nada!
2019 Montana High Country 375FL Fifth Wheel
2014 Chevy Duramax HD 6.6 - 3500 Diesel Dully Long bed Crew Cab