Rust-Oleum Stops Rust Automotive Dark Gray Primer Spray is a heavy-duty base coat that provides superior corrosion resistance and works beautifully with most automotive brands. With its fast-drying formula it can be top-coated or wet-sanded to an ultra-smooth finish in just 15 minutes. Provides a sound base coat for a smooth finish, prevents topcoats from soaking into the primed surfaceIdeal on interior / exterior use on bare or lightly rusted surfacesAlkyd formula that provides superior rust prevention, which provides lasting protection and beauty for projectsDries to the touch in 10 minutes can be recoated within 15-30 minutes