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So, I often need to blue small parts, and found that Brownell's Oxpho Blue is pretty good stuff. Durable, and it produces a nice blue-black that matches with a lot of factory bluing. I found that using a heat gun to hat parts up to about 250 degrees before applying it made it much more permanent.
This guy, however has got the cold blue process to end all. He's damned long winded, so I'll summarize. He applies Mark Lee Express Brown before using the Oxpho Blue, and by dumb luck, they are compatible and produce a beautiful and durable blue finish! I just tried it, and it works.
[ame]https://www.youtube.com/watch?v=X-CDOJF-TmY[/ame]
This guy, however has got the cold blue process to end all. He's damned long winded, so I'll summarize. He applies Mark Lee Express Brown before using the Oxpho Blue, and by dumb luck, they are compatible and produce a beautiful and durable blue finish! I just tried it, and it works.
[ame]https://www.youtube.com/watch?v=X-CDOJF-TmY[/ame]