Just picked up a pair of "new" straight jackets in polished aluminium with fire lenses. The icons have seen better days and the black has mostly worn off so I would like to paint them black. I have read the guides which suggested dipping in boiling water then using a pin to remove icons. What I was wondering is if the polished aluminium frame is an FMJ coating as I don't want to risk ruining the finish which is in decent condition. Thanks in advance for any advice on this. If it's too risky I might just leave them as is!