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Zinsser Block Filler 2X High Build Primer in White prepares concrete and masonry for a smoother, more uniform painted finish. Its thick, water-based acrylic formula fills pinholes and small voids while sealing porous surfaces to improve topcoat coverage and sheen. Suitable for interior and exterior residential, commercial and industrial projects, it adheres to properly prepared bare or previously painted concrete, cinderblock, brick, stucco, fiber cement, plaster and mortar. The formula tolerates masonry alkalinity up to pH 13 and helps protect topcoats against concrete salt damage. Apply with a synthetic-bristle brush, roller or airless sprayer. It dries to the touch in about 30 minutes and can be recoated in 1 hour under recommended conditions. This 1-gallon can covers approximately 100 square feet of unpainted masonry or up to 300 square feet of previously painted surfaces, depending on porosity and application. Clean tools promptly with warm water and detergent. Not recommended for floors, decks, below-grade areas or prolonged water exposure.
