Boater's world recommended this 303 stuff for my vinyl seats and it worked very well. A friend at work (fellow boater) bought a gallon via the internet and gave me more of the stuff...I visited the 303 website and it claims it can be used on most stuff and has UV protectant. It claims to be especially well suited for gel coat boat finished on fiberglass. So...tonight I did the entire boat using 303 and it really does look great. It was clean from a week or so ago when I washed it, and I merely sprayed it on and wiped it off with a towel. I did the fiberglass, the engine, everything. So...has anybody else used this? I did a search for past 303 discussions and the reviews were generally positive, the biggest competitor being "Bass Boat Saver" which I have not tried. I wish we knew what was in each mixture, but I'm thinking I'm pretty much sold on the 303 and was wondering if you guys had the same experience. Would a UV resistant paste wax be superior to this product? Thanks, Bassoneer