I used Protect-All ONCE. Never again. It left what looked like an oily rainbow film on the fiberglass. I could rub it off, with a lot of effort, but then I think I was also rubbing off any protection that might have been on it.
Back to my old standby. Meguiars RV/Marine #50. A bit of work, but protection lasts a long time.
2013 Rockwood 8289WS
Mods: Central Vac, PI EMS-HW50C, 2025RV, (2) SCS225 Trojans, PD9260, Awning Remotes & LED Lights, Eliminators, External Water Filter,, Intellijacks
2008 RAM 3500 Cab&Chassis Hauler Bed, B&W Companion Hitch
All My Modifications are at this link: