A water-based acrylic base coat used in a base/top coat system to improve the adhesion of GAF AcrylicTop Coat and provide bleed-blocking on asphalt roof. GAF Bleed-Block Acrylic Base Coat improves the adhesion of GAF Acrylic Top Coat and provides bleed-blocking on asphalt roofs. It is designed for easy application with conventional or airless spray equipment, as well as a brush or roller.