Perma-Flex, the one-step liquid rubber repair product, is the most versatile, durable and cost-effective repair product available. Its repair and adhesive qualities are unmatched in the industry and make it perfect for sealing roofs, cracks and open seams. Molecular bonding and high flexibility make this product durable and long-lasting. Perma-Flex is also UV resistant. Because Perma-Flex is a permanent repair, it can save you money on stubborn repairs that constantly need fixing.