Ive used the birchwood casey cold blue solution, which I assume is similar to durablue, on a variety of things including firearms, from small parts to entire barreled actions.
The quality of the finish depends entirely on the time and effort spent on the surface preparation. If the metal is cleaned and polished to a mirror finish that appears almost like chrome or nickel, it will come up very nice with a couple of coats of cold blue solution. However, if the metal surface is not near perfect, the finish will be disappointingly cheap and nasty looking. Imho anyway.
A quick prep summary of what I do >
Usual cleaning process of chemical agents and wire brushes if rust present, then if sanding is required, go right down to 1200 (or finer) grit wet and dry.
Then use multiple buffing wheels with at least three different density of cloth firmness, with the appropriate change in polishing compound to match the wheel.
If anything is imperfect, go back to a step that will correct that imperfection, and repeat the process for that particular area.
Apply solution, let dry, wash off. If unhappy, polish again and do another coat.
Repeat as many times as desired.
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