🛠️ Flex Your Repair Skills with Flex Seal! 2.5 gallons of liquid rubber for all your projects! Transform any surface into a watertight barrier! Engineered for professionals, trusted by DIYers. Defend against moisture, UV rays, and chemicals. Brush, roll, dip, or pour—your choice! Waterproof Flexible UV Resistant Flex Seal Liquid MAX is a professional-grade liquid rubber coating sealant available in a generous 2.5-gallon size. It provides a waterproof, flexible, and breathable barrier that is UV and chemical resistant, making it ideal for a variety of applications including roof repairs, basements, RVs, campers, trailers, and marine surfaces.