Paint factory- Direct to metal hammered effect paint(black). Paint factory direct to metal hammered effect paint is a hammered finish top coat paint that will adhere to interior and exterior surfaces including concrete, metal and wood. Directions: Stir well before use. Remove all loose rust and flaking paint with a wire brush, wet and dry paper or steel wool. Using a suitable diluted detergent, remove all grease, grime and dirt and allow to air dry. Any colour indication depicted on the front of this can is only intended as a guide- always paint a test patch in an inconspicuous area to check for compatibility and colour suitability and leave to dry for 1 hour.