Dicor Corp. BT-1834-1 RV Trailer Camper Sealants Butyl Tape Roof Repair Tape; Use To Seal Uniquely Shaped Joints; Butyl Tape; Gray Ideal For Sealing Uniquely Shaped Joints. Low Temperature Flexibility: No Cracking, No Adhesion Loss At -20 Degree Fahrenheit Chemical Resistance: Excellent To Water, Vapor And Alcohol. Weaken To Acids And Bases. Avoid Use With Organic Solvents. Corrosivity: No Staining, Etching Or Other Signs Of Corrosion On Galvanized Or Coated Metals Flammability: Nonflammable. Appearance: Grey, Extruded Butyl Sealant Tape Water Resistance: Sealant Maintains Adhesion To Galvanized Metal After Being Submerged For 30 Days At 120 Degree Fahrenheit