Kool Seal, 2" x 3', Flexx Sealer, Seals Cracked Or Rusted Flashings, Vent Pipes, Rain Gutters & Downspouts, Stops Leaks Between Shingles, Roof Seams, Laps, Soffits, Parapet Walls, Bonds Immediately, Seals Instantly, No Curing Time Needed, Remains Flexible, Never Hardens, Cracks, Peels Or Shrinks, Stops Leaks, Rust & Corrosion, Mold & Mildew Resistant, Effectively Use From 76 To 180 Degrees, Lifetime Guarantee, Non-Toxic, Easily Shaped & Molded, Recommended For All Roof Types, Clamshell.