High-Build Primer Surfacer is a flexibleÊacrylic coating for priming steel, aluminum, urethane, fiberglass and plastics. Features Provides superior adhesion Excellent filling properties Works on multiple substrates, including metal and plastic Easy to sand Topcoat with most refinish material Applications Steel Aluminum Plastic SMC Fiberglass Properties 20 oz. Aerosol Coverage: 11 sq. ft. at 2 mil DFT Coats: 2-3 medium wet Dry time: 1 hr Flash time: 5-10 min between coats