Seal Even The Toughest Leaks. Deeps Into Cracks And Holes. Dries To A Watertight, Flexible, Rubberized Coating. Stays Flexible And Pliable; Lasts Many Years. It Is Ideal For A Variety Of Roof Surfaces Including Shingles, Metal Roofs, Chimneys, Skylights, Gutters, Pipes, And Many Other Surfaces