303 protectant or wax on gelcoat?

not sure if i should continue to wax my boat or start spraying 303 on it. the bottle says its like sunscreen on my stuff. i have some black on it so im concerened about fading.

I wax my boat at the beginning and end of the season...also sometimes after a long boating trip e.g. boat in the water for a week. I use 303 in between. Before I go out for a day on the lake, I also put a light coat of 303 on the boat. When I go to wipe it down, I spray with car detailer. Never get a any water spots. I have black on my boat also and so far no fading.