The key to getting that rig shiny is to completely remove the oxidative layer of fiberglass. We recommend using an oxalic acid-based powder cleanser along with a 3M ultra-fine sanding pad (similar to wet sanding) to completely remove the white chalkiness. No matter what you put on the rig, if you still have oxidation, you will be masking that oxidation. The product will be applied to the oxidative layer and break down quickly. Unfortunately, as another person posted, there is no quick and easy fix to oxidation. Be careful of using Zep floor finish as it is made for floors, not gelcoat specifically used on motorhomes, and does not have any UV protection. The sun is what ultimately breaks down fiberglass and while Zep will make the surface shiny you are not protecting the fiberglass from further oxidation, only masking the problem.
Poli Glow Products, Inc.
Superior Fiberglass Restoration, Protection & Shine for your RV and Boat
Made in the USA since 1989