Gallon, Plastic Roof Cement, Applies Well On Dry Surfaces, Achieves A Tough, Long Lasting Flexible Film In All Weather,Spreads Easily & Is Heavy Bodied, Repairs Holes, Cracks, Splits On Asphalt Coated, Composition And Metal Roofs, Seals Around Chimneys, Vents, Skylights, Flashings As Well As Tabs Of Asphalt Shingles, Meets Or Exceeds All Requirements Of ASTM Specification D-4586, Type I.