OmniPrep is a premium quality, acrylic latex primer specifically designed for interior surfaces. It promotes adhesion to a variety of challenging substrates and resists bleed-through from both solvent-sensitive and water- sensitive stains. Highly resistant to alkalinity and efflorescence, OmniPrep can be applied to surfaces with a pH of 6 to 13, allowing for its use on concrete and masonry substrates in as little as 7 days.