SMARTCOAT™ 210 is a highly engineered, single-component, water-based primer designed for application over TPO, Concrete, Galvalume, Galvanized Steel, Aluminum, and other common roofing substrates - including difficult to adhere to membranes or surfaces. Do not apply over silicone. SMARTCOAT 210 is designed to improve adhesion of SMARTCOAT 400 series coatings to the substrate and imparts water-resistant qualities before these coatings are applied.