Re: Aluminum's not supposed to react like this.
Justin,
I, too have had problems as you described. As a gun refinisher I feel your pain. We had a Winchester .22 reciever that acted in a similar manner, our solution was to powder coat the darn thing. On another gun, a revolver we thought was aluminum, no dice. This was some exotic metal ( probably with some magnesium ) that actually took a cold blue however we were afraid to run it through the hot tanks so we wound up powder coating it also. Evidently with firearms there are many variables to keep us on our toes. I do have a question for you. Are you able to obtain a gloss finish on anodized pieces? The parts we have tried lose their gloss in the anodizing process (probably from the acid-at least thats the case when we acid dip some parts before hot bluing). Any thoughts?
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