Black Rust-Oleum Automotive Sandable Primer Spray-249418 12 oz: Is designed to provide a tough rust-inhibitive base for most brands of automotive lacquers and enamels. Sands smooth to promote a smooth uniform topcoat finish. Sandable Primer features an advanced spray system that allows you to spray at any angle even upside down for those hard to reach areas. A comfort spray tip with wider finger pad reduces fatigue caused by continuous spraying.