Flex Seal Flex Glue is an easy-to-use, super-strong, rubberized waterproof glue that instantly bonds, seals and repairs virtually everything. No need for screws or nails, it's perfect for all types of repairs. This glue can be used on dry or wet surfaces and even underwater. Its strong instant-grab adhesive works like a magnet, locks into place and holds on tight. Easy-to-use, super strong, rubberized waterproof glue instantly bonds, seals, and repairs virtually everything. Super strong permanent adhesive bonds fast and even works underwater. oz. squeeze tube capacity. Comes color. Paintable and solvent-free glue that remains flexible. Can be applied to overhead surfaces. VOC compliant. Mold- and mildew-resistant. UV- and weather-resistant. Low-odor adhesive.