Available in 3 sizes Due to the unique formulation of Hammerite Paints, brushes and equipment should be cleaned with Hammerite Brush Cleaner & Thinners. As well as cleaning brushes and equipment it also thins Hammerite Paints for spray application. For cleaning brushes and spills. Removes dirt, grim, salt and loose rust. The only thinner suitable for Hammerite Metal Paint.