Might be a dumb question but why blue it only to strip it back off. could you just use the toilet bowl cleaner and skip the bluing part?Al, After the engraving and the gun is blued I strip off the bluing with Lysol toilet bowl cleaner 10x power and after that scrub the part's with baking soda then run under hot water and dry,hope this is of help to my fellow engraver. J.J.