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Sikaflex® -221 is a high-quality multipurpose non-sag 1-c polyurethane sealant that cures on exposure to atmospheric humidity to form a durable elastomer. Meets approvals ASTM C920 types and Federal Specifications TT-S-00230C. Elastic .Low odor ,resistant to weathering exposure,Non-corrosive ,can be overpainted and can be sanded. Lower VOC’s ,bonds well to a wide variety of substrates .