Box of 12 x Sikaflex 221 Black is a high quality multi-purpose 1 x component polyurethane adhesive and sealant that cures 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. Also sold in singles BJ150. Sika is a trade mark of Sika Limited.