An all-weather roofing Mastic containing special modifiers to enhance bonding to damp surfaces, TAM-Pro 803 contains select Asphalts, petroleum solvents, tough reinforcing fibers, and wetting agents. It provides excellent waterproofing properties for temporary repairs, or more permanent repairs when used with Glass reinforcement. It dries to form a durable, but pliable, seal that allows for minor expansion and contraction. This product is used for flashing construction and other detail roofing work such as tie-offs or Shingle securement. 100% Asbestos Free.