Sikaflex?-221 Black is a high-quality multi-purpose 1-component polyurethane adhesive / sealant thatcures on exposure to atmospheric humidity. It is suitable for internal sealing and simple bonding applications. Bonds well to a wide variety of substrates. Resistant to ageing. Can be painted. 300ml Cartridge. Sold in singles or BJ150-12 Outer Boxes x 12.