Water-based, non-toxic, and non-flammable, FERTAN Rust Converter stops rust corrosion on variety of surfaces and converts those surfaces into black zinc phosphate coating that is suited for use as fresh paint base. Zinc phosphate coating will protect metal for up to 6 months before additional primer or paint needs to be applied. Under ideal conditions (75°F and 70% humidity), FERTAN Rust Converter can work in as little as 4-6 hours. No deep scrubbing or sandblasting is needed.