I've painted a few of the combination machines , I used appliance spray paint. On the ones that were a little rusty we removed the rust with sand paper and a brush wheel on a drill. Then we painted the bare spots with primer ,then sprayed on a punched metal Spray to get the look of the metal back and then we put appliance paint over that.on other I just used a cloth with paint thinner on it and wiped the machine down to remove dirt and grease , then painted it with appliance paint