P-160 is a high quality, plasticizer free, single component, water based, acrylic primer. P-160 is designed for application over smooth asphalt roof surfaces to enhance adhesion of silicone roof coatings. P-160 is formulated to act as a barrier between the asphalt surface and the silicone roof coating to prevent yellowing of the coating due to chemicals bleeding out of the asphalt roof. P-160 can be applied with spray, brush, or roller. Spray application is preferred method.