Rust Bullet Automotive 1/4 Pint – Our Automotive Formula contains more metal and is a bit thinner than our Standard Formula allowing for an easy application with HVLP automotive finishing guns, as well as brush or roller, and provides a smoother finish usually desired for automotive projects.. Use Rust Bullet Automotive Formula as a stand-alone coating, or in combination with Rust Bullet BlackShell, Rust Bullet WhiteShell, Rust Bullet ColorShells or Rust Bullet Clear Shot for unbeatable rust protection. One 1/4 Pint covers approx. 12 sq. ft. per coat – minimum 2 coat application required.