Richard, I have used penetrol on my 1994 allegro bay DP an it looks like its just been painted an out of the showroom. Some told me another forum that it wouldnt work. well i tried a place with a rag putting it on. I didnt like that for it made it streaked. So i use a pad (the kind you put wax on with) and work in straight one motion direction. "DONT" wipe off. then after the first coat dries (after you done the whole coach) put a 2nd coat on. An oh yeah be sure before you put on the penetrol, you really use a good cleaner on your coach. if not ever thing that on it like black streaks will show under the penetrol an wont come off. so clean really good first then 2 "light" coats of penetrol, not heavy, an it will shine an stay that way, been 2 yrs on mine an i only wash it an shines like new.
Tom and Nancy
1998 Four Winds class C, 31ft, V-10
2008 ford Taurus in tow