Brush or squeegee grade, waterproof adhesive made from asphalt, solvents, and organic fibers. Designed for bonding layers of asphalt coated base sheets. Eliminates burn and fire hazards of hot asphalt. U.L. Class A in a variety of roof systems. Use in applications with 25# or heavier asphalt-coated fiberglass base sheets, conventional mineral surface cap sheet, polyester fabric and bonding gravel or granule surfacing. Coverage varies with smoothness and porosity of surface coated.