Rust-Oleum Stops Rust Rusty Metal Primer bonds tightly to rust to form a surface that topcoats can easily adhere to. This formula drives out corrosive air and moisture other primers leave behind. It features a comfort tip with a wider finger pad to reduce fatigue caused by continuous spraying. In addition, there is an any-angle spray feature that allows you to spray in any direction, even upside down. 12oz.