Rust-Oleum Automotive Filler Primer Spray Paint - Gray Color Name:Gray   Rust-Oleum Filler Primer is a hi-build formula that fills in minor imperfections in the surface and improves topcoat adhesion and appearance. This product is suitable for use on metal, wood and fiberglass surfaces. Filler 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 a wider finger pad reduces fatigue caused by continuous spraying. For more information, visit the parent website of Rust-Oleum or Truworth Homes.