EZ Sand Acrylic Urethane Primer is a premium grade lead & chromate free two component primer surfacer. It provides exceptional fill and build characteristics providing a base that yields excellent top coat hold out, gloss and D.O.I. (distinctness of image). This primer sands easily wet or dry and can be directly topcoated with alkyd enamels, acrylic enamels, alcquers and basecoat/clearcoat systems. Mix ratio is 4:1:1 (four parts primer, to one part activator, to one part Transtar® Urethane Reducer based on shop temperature).