Flex Seal Liquid is a rubberized sealant coating designed to seal, coat, and stop leaks quickly. This 128 fl oz (3.79 L) gray formula can be brushed, rolled, dipped, or poured, creating a durable waterproof barrier that protects surfaces from moisture, air, and corrosion. Ideal for roofs, gutters, foundations, pipes, and various indoor and outdoor repairs, providing long-lasting flexible protection.