im pretty sure my overflow tank has a crack or something like this because it leaked for a day and a half then stopped. tank was empty so i filled it up and it started again and stopped. right after it stopped i opened the hood and the tank was empty sooo..propable tank. my question is i found some "Bud's leak stopper" it said it could stop leaks in plastic and metals. it is made for the cooling system. my question is since its just the tank should i just go get it replaced or take my chances with this stuff i just dont want to do any damage to any thing else like water pump or clog the radiator....i just was wondering do these leak stoppers really work?