I also used GB and love the stuff!!! I taped off the paint and sprayed three coats for a nearly flawless, even finish. The best part is how this products dries evenly. I've also used it on some black interior pieces with great results. It helps cover up scratches/inperfections but also hides the original cladding texture a bit.
The Bad: GB still comes off with a strong dose of gasoline and it's essentially a special paint vs keeping the cladding original (and faded).
http://gatorbackcoatings.com/home.htm
3 aerosol cans of GB and one can of cleaner will give you enough to spray the entire cladding and have some leftover for future touch-ups.