This is a TRE6401 2K Primer Gray. EZ Sand Acrylic Urethane Primer is a premium grade lead & chromate-free two component primer surfacer. It provides exceptional fill & build characteristics providing a base that yields. Excellent topcoat hold out, gloss & DOI. This primer sands easily wet & dry & can be directly topcoated with alkyd enamels, acrylic enamels, lacquers & basecoat/clearcoat systems. Mix ratio is 4:1:1 (four parts primer to one part activator, to one part urethane reducer, based on shop temperature) Requires activator PN6934)