How can you tell if there is no gel coat left on fiberglass? Front and rear caps on my 04 Carriage Cameo are oxidized. After washing and allowing the body to dry, if I rub my finger over the fiberglass caps, I get white on my finger but not from the sides. Have Marine 31 Gel Coat heavy oxidation cleaner along with Meguiar's 67 Marine-RV One step compound aggressive cleaner plus polish and a couple of other Marine polishes, cleaners and waxes along with an orbital polisher/buffer. I live full-time in it and my main problem is that it is in the full sun and after 6 months, the caps get heavy red and green algae build up. Due to change in health, I don't feel it's worth spending big money for maybe 5 more years of usage.