Abrade smooth surfaces and remove all loose rust and flaking paint with a wire brush. Remove dirt, dust and grease with diluted detergent. Rinse with clean water and allow time to dry. Paint a test patch of Hammerite Direct to Rust Metal Paint Hammered onto painted surfaces and leave for 1 hour. If there is no reaction apply Hammerite Direct to Rust Metal Paint Hammered directly to surface. If there is a reaction, remove all paint before applying Hammerite Direct to Rust Metal Paint Hammered. Dry sanding, flame cutting and/or welding of the dry paint film will give rise to dust and/or hazardous fumes. Wet sanding/flatting should be used wherever possible. If exposure cannot be avoided by the provision of local exhaust ventilation, suitable respiratory protective equipment should be used.