Pur Black was developed especially for outdoor use. Its black color blends intoThe surrounding environment and never looks dirty. It will seal and stopThe passage of air, gases, water, dust, fibers, and sound into a building. Sealing air leaks also reducesThe number of places than insects can use to enter a house. Pur Black is a rigid, low expanding, closed-cell foam that is applied with a foam gun. One 750 ml canister, making 1,200 linear feet of 1/2" bead. It is tack-free in ten minutes and trimmable in thirty minutes.