ETERNABOND Roof Seal One-Step Tape is 35 mil thick and used to seal roof joints and tears, flashings, copings, skylights, gutters, and more â perfect for repairing and restoring roofs on mobile homes and RVs. The UV-stable backing on Roof Seal makes it ideal for use in sunny environments. The elongation factor is very high, which permits Roof Seal to expand or contract with changing conditions. The simple installation only requires some surface preparation before use. Roof Seal Tape seals to itself so it can be cut and folded around an object. Roof Seal adhesive uses MicroSealant Technology, a 100% solids formulation consisting of synthetic resins, thermoplastics, and noncuring rubber with a built-in primer. The adhesive side has a silicone lining that prevents it from sticking to other surfaces before application.• Ideal for use in sunny environments• Simple installation with some surface prep required before use• Very high elongation factor allows it to expand or contract with changing conditions• Silicone lining prevents it from sticking to surfaces before application• 4"W x 50'L roll High elongation factor permits it to expand & contract with changing conditions Simple installation only requires some surface preparation before use Seals to itself so it can be cut & folded around an object | Camping World ETERNABOND Roof Seal Tape, 4" x 50', White