Gallon, Black Jack, Fibered Plastic Roof Cement, Wet Or Dry Surface, Patching Cracks & Breaks In Roofing Surfaces, Firewalls, Gutters, Chimneys, Flashings, Etc, Particularly Good In Emergency Situations For Stopping Leaks On Damp Surfaces, Ideal For Patching & Roof Maintenance, Sealing & Repairing Shingle Tabs, Flashings, Roof Seams & Gable Joints, Versatile, Use On Any Dry Or Damp Surface, Waterproof, Forms A Tight Strong Seal, Easy-To-Use, Stays Soft & Pliable.