If it is oxidized you need to get it buffed out. Then protect it with BTS. There are many great waxes like stated above, but the best protection you can give is with BTS. It is a polymer formula that actually bonds with the gelcoat and gives it great UV protection. Very easy too, no need for buffing and buffing and rebuffing. Just apply, let dry, and wipe off with a towel. You can even do it in the sun unlike waxes. Yes it is in a spray bottle, but it is not a wax. It also removes all your old wax for you too. You can also protect your vinyl, plastics, trailer, motor etc. all with one product and VERY easily. Boat will look showroom and stay that way.
Derek Chance