Prep your project s surface with Rust-Oleum Self-Etching Primer 12 oz. With a pintura base it provides maximum adhesion and smoothness of the top coat to help create a professional finished look. It s formulated to stop rust and it can be used to prepare bare metal aluminum and fiberglass surfaces. This etching primer for aluminum has an advanced spray system that allows to you work from every angle. It also has a comfort tip making it easy to use.