I used Zaino on my boat, and i was going to try using 303 on it as a quick detailer for extra protection after each time I used it and wash it...mainly for extra UV protection. I supect it will smear going over any sealant or wax, but I will try it this weekend and let you know how it goes......
303 suggests using it on bare fiberglass, I want more protection that just using that alone though............