RUST RECONVERTER LT stops further erosion and rusting of machinery, tools, vehicles, equipment, boats, metal buildings and more. Rust Reconverter LT chemically converts rust into a black organic complex while a clear acrylic coating is formed at the surface. When used indoors, the coating can last for years even without painting. When used outdoors or in high humidity applications, it should be painted over using an oil-based enamel or epoxy paint. Covers up to 500 square feet per gallon.