Brush the surface with a wire brush to remove loose rust. Apply Berger Rust Master to the rust, applying deeply in pitted areas. Rust will change colour while reacting to the rust. Allow Rust Master to react with rust until there is no further change in colour. This process will depend on harshness of rust. Re apply in case of severe rust cases. Wash thoroughly with water, wipe with a clean cloth and allow to dry. Immediately after drying, apply a rust protective Brolac Primer / Undercoat e.g. Brolac Red Oxide