Wattyl Aqua Prep Primer Sealer Undercoat is based on Wattyl advanced adhesion technology and is specially formulated to provide superior adhesion to most interior and exterior surfaces, especially enamels. It is easy to apply, dries quickly, and has excellent sanding properties to achieve an ultra-smooth platform for the ultimate finish with any water-based or oil-based finish coats.Based on Wattyl advanced adhesion technology and is specially formulated to provide superior adhesion to most interior and exterior surfaces, especially enamelsEasy to apply and dries quicklyHas excellent sanding properties to achieve an ultra-smooth platform for the ultimate finish with any water-based or oil-based finish coats