Well I tryed the vertglas on my boat last season... Mine was oxidized on the top of the blue where the water line is. And bad on the back where the supra logo is.. I got all of it off and used the sealer. It looked GREAT!! But over the months it started to chip away in spots and looked like crap! SO next season I will have to remove all of the sealer and redo it all.. I would rate vertglas a 5.. If it did not chip I would have gave it a 10.... Bad thing about it I keep it in a garage and wipe it off EVERY time I pull out....