I purchased an Israeli Police FN Hi Power as a project pistol. One of the things that I am doing is refinishing to blue it, maybe Duracoat it. Can anyone advise me on a proven method to strip what I think is the original black enamel-type finish? I have searched the web, but do not see this specific finish mentioned in prepping the metal for refinishing. I have seen Naval Jelly frequently noted as effective in removing bluing, but am not sufficiently confident in that information to proceed with that. Thanks for any suggestions.