Bonds great and ensures a high quality smooth finish. Poxoprime is the epoxy primer for application over unpainted concrete and plaster surfaces. It is light gray in color and should be used as an undercoat for Zeron. Poxoprime soaks in and seals plaster or concrete to prevent blistering of the finished coats. One gallon covers approximately 175-225 sq. ft. Do not use as a primer with rubber base paint. Includes painting instructions.