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Crack flex sealant is a 1-part polyurethane for repairing cracks up to 1 In. wide in horizontal concrete surfaces. Elastic technology formulation allows the sealant to remain flexible and move with the crack. Forms a permanent watertight seal. Bonds to concrete: 24 hour green, 1 hour wet. Self leveling. Indoor/outdoor. Gray. Shelf life: 12 months.