Valspar Acrylic Alkali-Resistant Primer is a 100% acrylic primer/sealer, specially formulated to resist "alkali burn" commonly associated with new-cementitious substrates. Its special formulation provides excellent coverage, adhesion and ease of application. It dries fast, is non-yellowing and has excellent priming and sealing properties. Can be applied to all new cementitious substrates, such as masonry, stucco and cinder block with a pH of 6 to 13. Gives a mildew-resistant coating. For interior and exterior uses.