![]() The layer acts as an excellent primer for both oil and epoxy-based paints. Tannic acid produces a protective bluish-black ferric tannate inert primer layer, which can stand alone to protect against exterior weather conditions or be painted over for better appearance. It can be used on metal parts that are exposed to exterior weather conditions if it is top coated with a quality paint or coating. Phosphoric acid rust converter turns the iron oxide into a ferric phosphate inert layer. Rust converter is comprised of phosphoric acid or tannic acid or a blend of both. Rust converter, also known as rust reformer, is a chemical solution or primer that can be directly applied to the metal surface to convert iron oxide (rust) to a protective chemical barrier that is resistant to moisture and protects the surface from further corrosion. Rust converter will stop rust, however the finish quality is rough
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