RUST-OLEUM® Primer sealer helps bond base coats to the surface to achieve a uniform and smooth finish. When applied over a RUST-OLEUM® automotive primer, this product also prevents topcoat paint from soaking into the primed surface. This product is suitable for use on metal, wood and fiberglass surfaces. Primer sealer 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.