Polyurethane Concrete Crack Sealant is a construction-grade polyurethane sealant that repairs, seals, and waterproofs cracks in concrete, masonry, and stucco surfaces. With a nonsag formula, treat vertical and horizontal applications with this sealant that dries to a durable and permanent flexible finish. Textured to blend with the concrete surface, you can avoid unsightly repairs. To apply, clean and dry the surface, caulk the product with a standard caulk gun over the repair surface, and let dry for two hours. The Quikrete Cos. Inc. 800-282-5828. www.quikrete.com