EXCEL Rust Shield 100% Acrylic Waterborne DTM Primer - Gray is a professional quality 100% acrylic waterborne rust inhibitive primer/sealer designed for use on a variety of properly prepared interior and exterior substrates in light to moderate industrial, commercial, maintenance, or architectural environments. It offers excellent coverage and adhesion, moisture and corrosion resistance and ease of application. It dries fast, provides excellent durability, is mildew resistant, resists flash rusting, and is an excellent base coat for both water-based and alkyd/oil-based finish coatings. Great for both interior & exterior use.