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Henry(R) 900 flashing and construction sealant - gray is a single component, moisture-curing compound formulated for use as a general-purpose construction sealant. When fully cured, Henry(R) 900 flashing and construction sealant - gray forms a tough, durable bond. Henry(R) 900 flashing and construction sealant - gray aggressively adheres to most common building materials and is paintable when fully cured.