I have a Class C, the front section of the cabover part was beat up pretty bad. Based on what the roof and sloping front of the cabover looks like, I'd say it had been in a hail storm at least once (maybe more). Also I had tiny pin holes in the thin aluminum skin. I rolled primer & Snow roof over it to seal the leaks and to try and keep the heat build up down. It worked. It doesn't look too bad (even after driving it from NC to NM and then NM to Corpus Christi). But I don't think I would want to have it all over a bus or RV. Even with a smooth nap roller it is "textured". It has roller marks and other marks. This is not like paint. It is thick, goopy and will run on a vertical surface. It does not cover evenly. The front section was white to start with. The primer is a light grey and I rolled 3 coats (5 in some spots as touch ups). But the front looks so much better and it is much cooler than it used to be.