I've been using this Permatex 80050 silicone for many years now for obvious reasons. It's awesome stuff. It works on and adheres to anything you'll ever need it to. All the weather elements in Texas is no challenge to it. I can find nothing negative about this silicone. The longest I've ever stored a used tube is about a year and other than at the tip it's still good to go. Very happy with it and will continue to purchase.