I am in the same boat with a 16 year old M/H. I did the Zeps floor polish on the top part and it looks like new. The lower doors are scratched and front are pitted from a trip to Alaska and the back bumper hit a rock. After I did a fiber glass repair on the back bumper I tried the brush and tip method that they use on boats but did not like the out come. I was thinking about just spray painting the lower section with the hi gloss Rustoleam or the tractor paint that they sell at Tractor Supply. I was following this thread with interest hoping someone actually did this and could report on their success.