This roll of Butyl Putty tape lasts longer than most other tapes on the market and wont crack either. This Butyl Putty tape is commonly used on campers, trailers, and rvs with rubber EPDM roofing since it waterproofs longer than other putties and waterproofs very well. It is also very commonly used for window seals, flanges, siding and just about everything relating to RVs, Campers, Trailers, boats, etc. Butyl Tru Seal is a non-hardening, off white tough, butyl elastic material which has excellent sealing properties to metal, glass and plastic lap points. This material increases in adhesion with age after application assuring a long lasting seal. Features & Specifications Non-hardening Excellent sealing properties Increases in adhesion with age Color: Off-White 3/16 Inch X 1 Inch X 20 Feet