Rust-Oleum Dark Green Stops Rust Self Etching Filler Primer Spray, 12 oz. is a specially formulated primer designed to provide superior adhesion and corrosion resistance on metal surfaces. This dark green primer acts as a filler and etching agent, creating a strong bond that helps prevent rust and ensures long-lasting protection. It is i for use on a variety of metal substrates, preparing the surface for topcoats and enhancing durability. The convenient spray application allows for even coverage and quick drying, making it for both professional and DIY projects.