Hammerite Kurust Rust Removal Stick Transforms rust to a sound surface in 15 minutes. Ideal for small areas of rust, stone chips and scratches. It can be topcoated after only 3 hours, with no primer or undercoat required. It is simple to apply - no need to rinse off. Converts iron oxide to stable iron complexes. Comes in a pencil format, 12.5ml.