EternaBond WHITE Mobile Home RV Rubber Roof Repair 4" x 20' - 20 Foot, 20 Feet 4" x 20' roll of authentic EternaBond tape. This product is cut from a master roll of 50 feet and repackaged to provide you with an economical solution for your project in a length not available from the manufacturer. EternaBond tape will not adhere to silicone caulk.