Mar-Hyde™ One-Step Rust Converter, 3513, 1 qt, 6 per case

One-Step Rust Converter Primer Sealer is water -based latex containing rust modifiers, which is designed for application directly over tightly bonded rust on iron or steel. It's also proven effective on new degreased or mild steel where flash-rusting has occurred. Shortly after application, the rusted surface will change from white to purple to a stable black coating. A uniform black coating indicates the complete conversion of the rust; white streaks or remaining rust indicate that an additional coat is required.