age galvanized metal - Mix water, vinegar and salt in a small spray bottle. Use 2 tbsp. of salt per pint of water. Add vinegar for a 50/50 mixture. Dissolve the salt completely. 4 Spray the entire area you wish to distress with the solution. Scrub the area with a stiff bristle brush or steel wool. This will remove the protective galvanized coating that is on the metal so it will start to age more quickly. Continue until the metal has a dull appearance. Rinse and let air dry.