Sikaflex 221 is a high-quality, multi-purpose, non-sag 1-component polyurethane adhesive sealant that cures on exposure to atmospheric moisture to form a durable elastomer. This black sealant is ideal for making elastic, permanent seals with good adhesion to a wide variety of substrates including metals, metal primers, paint coatings, ceramic materials, and plastics. It is suitable for various sealing applications in agricultural machinery, construction, and industrial environments. The sealant offers excellent weather resistance and is paintable.