High-quality brown polyurethane sealant/adhesive that cures on exposure to atmospheric humidity. Designed for internal sealing and simple bonding applications, this multi-purpose product bonds well to a variety of substrates including metals, metal primers and paint coatings (2-C systems), plastics and ceramic materials.

NOTE: Please perform tests on original substrates or seek manufacturer’s advice before using Sikaflex® 221 on materials prone to stress cracking. This product is suitable for experienced professional users only.