I water proofed my tarp with some Kwik stuff from Dicks Sporting Goods. I haven't really tested it. I sprayed it with a hose and no leaks. I took it out on a trip last weekend after being in a stuff sack for 4 months. There were wrinkles on it, and it looked like it was rubbing off where the creases where. Should I re-water proof it with the same stuff or is there a better product. The first stuff i used was from WM camping section.... That was horrible stuff. I would NOT recommend that stuff. Someone told me to get some stuff called Trek7?