303 is the standard for protecting inflatable boats. I clean my raft with boatwash from NRS after a few trips and re-apply 303 to provide protection from the sun and to keep it looking great. Easy to use, just spray on, spread it with a soft cloth, let it sit awhile then remove excess. Great sunscreen for your expensive inflatable raft and it looks lke new when finished. It's pretty slick when first applied so be careful about when you put it on. Let it age a bit before using if you can. Otherwise the slickness goes away after a couple river days. I also use it to protect rubber and vinyl on my cars and RV (tires, molding strips, BBQ cover, etc.) Works great and lasts longer than other car detailing products I've used. Cures to a nice non-glossy shine. Makes black vinyl / tires look dark and new again.