The #501 Premium All Weather Roof Mastic is a professional grade mastic with buttery smooth consistency fortified with Power Gel Technology that adheres to most surfaces wet or dry. It is formulated for use with built-up systems, base tile roofs sheets, SBS modified bitumen membranes, ply sheets, shingles and other approved surfaces. Easily applied around all flashings including skylights, gutters, and in all crevices. Readily adheres to all prepared surfaces by using trowel or glove. This product is easily spread and used to repair leaks, cracked spots, and holes in shingles. This Homogeneous and tough blend will not mud crack or slip. It will remain highly resilient and durable through all seasons in all weather.