Sikaflex-221 is a high quality, multi-purpose, non-sag, one component, polyurethane sealant that cures on exposure to atmospheric humidity to form a durable elastomer.UseSikaflex-221 bonds well to a wide variety of substrates and is suitable for making permanent elastic seals of high adhesive strength. Suitable substrate materials are metals, metal primers and paint coatings (2-C systems), ceramic materials and plastics.Characteristics and Advantages 1-C formulation Elastic Low odour Resistant to ageing and weathering exposure Non-corrosive Can be overpainted Can be sanded Bonds well to a wide variety of substrates NSF-approved for incidental food contact ColourBlack, Grey, White & BluePackaging310ml cartridge - Black, Grey & White 600ml sausge - Black, Grey, Blue & White.