Heng's Industries 5855 RV Trailer Camper Sealants Butyl Rubber Tape 3/16" X 3/4" Off White (Quantity 1) Roof Repair Tape; Use To Seal Under Moldings/ Around Windows/ Doors And Vents; For Rubber Roofs; Trimable Butyl Tape; 3/16 Inch Thick x 3/4 Inch Width x 20 Foot Roll; Off White Ideal For Rubber Roofs. Off-White, Non-Hardening Elastic Butyl Based Material. Provides Excellent Sealing Adhesion To Any Type Of Metal, Wood, Concrete, Glass, Plastics, And Porous Surfaces Increases In Adhesion With Age After It Is Applied Can Be Pressed And Formed To Obtain A Water And Air Tight Seal