I used it on our 1996 Truck camper. But it did have the fiberglass sides. Scrubbed it down with Barkeepers friend. Then used a microfiber cloth. Dampen it and wipe the surface with it. You only want to rib it on less is more on this. First coat dries it will look bad. I'm talking about you will be asking your self why did I do this. But no fear, second coat does not help much. But again dampen the cloth. You want to just wet the surface and be sure to wipe up any drips before they can dry. Third coat looks better but don't stop there. 4th you will think its done but go for the 5th coat. And it will look great.
As for it looking bad and cracking in a couple of years. It does not do that here on the east coast. Or better yet in west Tn. But out west or south Fl. Yes it might do that, but the ones I have heard about. Was the ones that stopped after three coats. Everyone that did the 5th coat. There still happy even after 10 years.
One guy I will try to look it up. Did his Corvette in this. Last time I read about it (Done in 1999) He had stripped it back down. And re-coated the car 3 or 4 years ago. And he does live in South Tx.
If your unit has the fiberglass panels. This stuff works great and brings it back to new looking again. Now I would never put this on my painted 5th wheel. But then again its clear coated. I will be putting boat wax on it next week. And doing the paint on roof coating. Unit is a 2012, and plan on it lasting us as long as we need a 5th wheel.
Also will try to get pics of a 1995 Freightliner FLD120. Guy did the Red Devil floor #3 (That is what I used) Seen it a few weeks ago. And it still has the gloss shine on it. And he washes it in the Blue beacon washes 24 times per year.
Pete