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BLOCK-IT® Premium is a high-hiding, ultra-low VOC waterborne alkyd primer for use on a variety of previously painted or new interior and exterior surfaces. BLOCK-IT® Premium is excellent for blocking stains from food and grease, water or smoke damage, ballpoint or felt pen ink, lipstick, crayon, and tannin from woods such as cedar or redwood. Its innovative formulation also provides excellent adhesion and enamel holdout, good sandability, low odor, and superior flow-and-leveling for easy brush and roller application.