Heavy-duty repair on dry surfaces. Seal and patch leaks in asphalt, metal, masonry, or composition roofs. Blend of asphalt and inert mineral fibers. Smooth and easy spreading. Also used around chimneys, vents, flashings, gutters, and other roof protrusions. For best results over splits, breaks, angles and metal edges, reinforce with Glass Fabric. Surface must be dry. Meets ASTM D2822-75 Type I.