Flex Seal Pro Series Extreme Roof Tape is a super-strong, rubberized waterproof tape engineered for professional-grade roof repairs and tough sealing jobs. It's extra--thick, flexible backing conforms to uneven surfaces, instantly sealing out water, air, and moisture, even in extreme weather conditions. Designed to patch, bond, seal, and repair most roofing and building materials, it provides strong, flexible, long-lasting, and 100% waterproof protection. Perfect for roofs, shingles, flashing, vents, skylights, chimneys, gutters, and more.