Use McNett Seam Grip to waterproof seams on tents, backpacks, overmitts, gaiters, foulweather gear and more, or to repair small rips and holes. (All seams must be sealed in order for the item to be totally waterproof.) Easy to use--simply squeeze lightly and draw tube across seam; seal seams from the inside whenever possible. Before use, clean surfaces with isopropyl alcohol. 1-oz. tube is generally enough to seal all the main floor and rainfly seams on the average two-person backpacking tent.