Rust-Oleum 7769830 Stops Rust Spray Paint, 12-Ounce, Flat Rusty Metal Primer Use to prime exterior or interior heavily rusted metal surfaces only Oil-based formula provides a durable protective coating with excellent rust prevention Dries to touch in 15 minutes and covers up to 20 sq ft Primer provides a base for excellent adhesion and withstands demanding, heavy-use environments Creates a surface that topcoats can easily adhere to