Premium Quality, Commercial Grade Sealant. For Forming A Permanent, Water And Weather Proof Seals In Exterior Gaps And Joints. Elastic And Remains Flexible To Expand And Contract With Construction Material Movement, To Protect And Retain The Original Seal. Adheres To Asphalt, Metal, Brick, Aluminum, Glass And Fiberglass. For Use On Chimneys, Skylights, Flashings And Joints.