It is a single component water based ready to use Rust Converter Cum Primer. Rust Converter can be applied to just about any rusted iron or steel surface. It converts rust into a protective black layer that seals out moisture an protects against future corrosion. Mechanism : Rust converter primer consist of selected chemical and organic polymers. They react with rust and form a complex product which is stable bluish black coloured layer that prevents further corrosion. Colour: Light brown liquid which turns into bluish-black color on dyring.