BEHR PREMIUM® Concrete & Masonry Bonding Primer No. 880 is a high-performance, ready-to-use, water-based pre-treatment, designed specifically to promote optimum adhesion. To porous concrete, when properly applied, provides a sound surface with excellent resistance to alkali and efflorescence. The primer will appear slightly milky in the container, but it will dry to a clear, natural look. This specially formulated bonding primer can be used to improve bonding whenever a masonry coating is to be applied, using a product such as BEHR PREMIUM® Porch & Floor Paint, BEHR PREMIUM® Solid Color Concrete Stain, BEHR PREMIUM® Semi-Transparent Concrete Stain, or BEHR PREMIUM® 1-Part Epoxy Acrylic Concrete & Garage Floor Paint.