Have the same model and fade problem. waited till 30 days before warranty was up, took it to the dealer and they painted it with automotive paint and clear coat, keystone paid for it,
but my dealer sells a lot of keystone products so I think that may have had some influence. I've read some people get denied and it costs around 2000.00 for them to have it done. No amount of waxing will fix this ( ask me how I know )as it is inferior gel coat not a paint problem.
2018.5 3791 Rear Den Montana, on the lake
..... Disk Brakes, it`s the only way
2018 F350 Ford 6.7 Dually 4:10`s w/bags Top Dog (payload 5595 lbs)
Pullrite 2600 TrailAir Pin Mor/Ryde SRE 4000 X Factors.... real smooth ride