Has anyone out there used Kool Seal or something similar on a tar & gravel roof? My son says that using this would be an inexpensive way to repair our leaking roof (I hate the tar & gravel!) & would also reflect the sun's heat, so the house wouldn't get so hot. We live in Florida, our house has a slightly pitched roof of tar & gravel (possibly built); I'd like to know if we'll have any trouble down the road by doing this. Also, same question regarding a leaking shed with shingled roof. Any help would be greatly appreciated. Thanks so much.