Rust Converter - A rust converter is a chemical solution that reacts with iron oxide (rust) to convert it into a stable, protective layer, preventing further corrosion. It is commonly used in automotive, marine, and industrial applications as a primer before painting. * How Rust Converters Work Rust converters typically contain tannic acid and phosphoric acid. Tannic acid reacts with rust to form iron tannate, a black, stable compound. Phosphoric acid reacts with rust to form iron phosphate, which provides a protective layer. * How to Use a Rust Converter 1. Remove loose rust and debris using a wire brush or sandpaper. 2. Clean the surface with a degreaser to remove oil or contaminants. 3. Apply the rust converter evenly using a brush, spray, or roller. 4. Allow it to dry (typically 24 hours) as it chemically reacts. 5. Paint or coat the surface for added protection. # Rust Converter Manufacturer.