4.75 Gallon, Fibered Plastic Roof Cement, Ideal For Most Roof Repairs & Stops Roof Leaks Around Vent Pipes, Spouts, Valleys, Skylights, Gutters & Chimneys, Use For The Construction & Repair Of Flashings, Expands & Contracts With Weather, Forms A Tight Strong Seal, Stays Soft & Pliable.