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The odor is not acid, it's copper sulphate.
No matter how you apply it, how many times you apply it, whether you heat it, or whatever "secret" you use-it's still cold bluing. It will wear off quickly, probably stink, and quite possibly promote rusting.
Cold bluing is not the same as real bluing (either hot process or rust process.) Cold bluing is for touch ups, not for bluing large pieces (regardless of WHAT the package says.)
You are actually better off spraying your gun with Krylon spray paint than using any cold bluing solution to refinish large parts.
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