4:1 High Build Primer, Gray, 128oz Multipurpose primer offering the functionality of ‘3 products in 1’ - primer filler, primer surfacer, primer sealer. Use for spot repair and large panels. Excellent build and surface leveling properties. Easy to sand wet or dry. Can be applied direct to metal, over most plastics and over unsanded E-coat, aluminum* and galvanized. Tintable with up to 10% with urethane mixing base. Substrates: Bare metal, properly prepared aluminum and galvanized, GRP, SMC, fiberglass, polyester filler, OEM surfaces. Size: 1 US Gallon Tin. Color: Gray. CTN: 2 Requires System 20 hardeners UP2253 Yes - ETHYLBENZENE