From a post I did in 2014. We were one of the first Oxidation issues handled by JAYCO. I know that you do not have a warranty, but the story I the same.
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If you have a cap with the dark gel coat, odds are VERY GOOD you will encounter the oxidation, no mater what wax you use or how many times you wax it. At the first indication of oxidation, take it in to an authorized dealer and have them contact Jayco.
There are only 2 options for this,
1- Replace the entire cap,
2- Remove ALL the Gel-coat down to the fiberglass and paint it.
When Jayco authorized the repainting of our cap, we selected a LIGHT color (matched the side color using a computer color scanner) and not the original dark color. This was the BEST decision we could have made!!!! On the original dark gel coat the temperature of the cap was over 200 degrees, with the new white painted cap, it has maxed out at 119 degrees. The interior is a LOT cooler with the light paint.
If you decide to go with a paint job, you can not paint over the GelCoat as the oxidation will eventually seep through the paint. The GelCoat needs to be sanded down to the fiberglass.
If you search "oxidation" you will find a lot of posts regarding this subject. This one has the most posts in it.
https://www.jaycoowners.com/forums/f...ing-27493.html
The RV dealer that painted it has a 5 year warranty on the paint job!
Win win situation for us!
Don
My Registry
RVing with SOLAR