This long lasting roof patch seals leaks and stops water coming in and damaging your home. Easily applied to almost any roofing material and can even been applied when it is raining. Specially designed, all-weather formula protects against high winds and driving rain and promotes adhesion and sealing when using with asphalt, composition, metal roofing, and masonry surfaces. The unique use of reinforcing fibers provides strength, protection and a long life. Excellent for patching worn roofing or sealing flashing, gutters, downspouts, eaves, ventilators, skylights, cornices, and roof edges. Not for use on rubber surfaces.