Flex Seal Black Liquid Rubber Sealant, 1 Quart is a versatile and easy-to-use liquid rubber coating that provides a durable, waterproof seal on a variety of surfaces. This black liquid rubber sealant is for sealing leaks, cracks, and holes, ing long-lasting protection against moisture and corrosion. Its thick, flexible formula adheres to metal, wood, concrete, and more, creating a seamless barrier that withstands harsh weather conditions. I for both indoor and outdoor projects, Flex Seal is an essential solution for quick repairs and maintenance tasks around your home or workshop. Model Number: