FWIW: I prepped mine with just Bar Keepers Friend , it removed all the old wax and oxidation. (Don't use on aluminum,- Oxalic acid). Rinse well. RM3 has been on for over 3 years, with- *no problems. Touch up 1 or 2 coats annually. Applied RM3 to fiberglass and decals, used regular wax on painted cargo doors.
*Had an area on the top of the front cap that flaked after the first year, due to poor prep...(Hard to get out there). Cleaned again with BKF and a little more effort. No problems since, and cleaner did not affect other areas of RM3.
Hooligan, Pensacola, Fl -U.S. Coast Guard 1956-1985
2016 Thor Siesta Sprinter 24ST diesel -1972 Moto Guzzi
2008 Suzuki Grand Vitara TOAD