Sikaflex®-521 UV is a one-component, weather-resistant sealant based on Silane Terminated Polymers (STP) that cures on exposure to atmospheric moisture. This multi-purpose product is suitable for internal and external sealing applications. Sikaflex®-521 UV adheres well to a wide range of substrates and is suitable for elastic bonding and sealing. Suitable substrates include timber, metals, metal primers and paint coatings (2-component systems), ceramic materials and plastics. Seek manufacturer's advice and perform tests on original substrates before using Sikaflex®-521 UV on materials prone to stress cracking. This product is suitable for experienced professional users only. To ensure adhesion and material compatibility, tests with original substrates under actual conditions must be performed.
