Will be interested in your experiences with Protect-All. Mine is stored outside in partial shade and the previous owner spent three winters in Florida. He took good care of it and so do I so I am seeing no significant fading or yellowing yet. I can see a slight difference in color from the sides and rear cap (rear cap is 'whiter'). I've tried Protect All and 303 Protectant on the gelcoat but it always seems to leave visible smearing and swirls, no matter how much I rub. I've had the best success with an annual polish with NU Finish (doing it now). In between the Nu Finish applications, I use a product called No Wet (maybe once or twice a year if I am in the mood). So far for a 5 year old rig, it still looks new.
'07 Country Coach Allure 470 Siskiyou Summit #31578, Cummins ISL 425; 2014 Ford F150 toad; Air Force One Toad Brake.
Glen Allen, VA; Smith Mountain Lake, VA.