This 10.1 fl oz marine adhesive and sealant bundle includes one cartridge each of Sikaflex-291 white polyurethane sealant and Sikaflex-221 black multi-purpose polyurethane sealant. Sikaflex-291 is a fast-curing, boat builder-approved marine grade adhesive and sealant ideal for applications requiring speed. It bonds well to fiberglass, wood, metal and other common boat building materials. Sikaflex-221 is a versatile, high quality sealant suitable for permanent watertight sealing and bonding of metals, plastics, wood, and more. Together these two polyurethane sealants complement each other, providing both long-lasting seals above and below the water line as well as high strength, moisture resistant bonds between various materials used in boat construction and repair projects.