Another brand you might look in to is Flex-seal. It's advertised on those info-mercials......Guys take an aluminum rowboat, cuts out the bottom and installs a screen mesh window which he sprays w/ the Flex-seal and put the boat in water which he is sitting in as well.....and doesn't sink. I won't go that far but the stuff is pretty durable and sprays on smoothly. Home Depot came out w/ a generic version of it which costs less as well.....Its just called Flex-spray or something like that....so if you have a HD near you, check it out.