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Old 06-23-2013, 03:27 AM   #1
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Default Cold Bluing 4140

I fit a 10-8 sight on my M&P recently and I'm having trouble bluing the exposed metal on the front edge of the dovetail. 10-8 said to try Brownells cold blue, but I picked up some Birchwood Casey since it was available locally. Didn't work at all. I'd hate to have to send it somewhere to get it redone with the black salt bath nitrocarburizing finish. Any ideas?

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Old 06-23-2013, 03:33 AM   #2
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It is steel, right? If it is steel and degreased that cold blue will work.



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Old 06-23-2013, 03:42 AM   #3
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Yup. 4140 stock. I just did a slant pro for a 1911 today and it took the bluing like a champ.

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Old 08-23-2013, 02:34 PM   #4
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I know, I know, this Is an old thread but I need some help! I have an M53 Mosin Nagant that I'm trying to refinish and I bought the birchwood Casey bluing kit as well and the metal seems to not take the bluing as well as I would like. I degreased then I degreased some more then I degreased some more, before and after the blue/rust remover. I made sure to wear gloves as well so the oil from my fingers wouldn't touch the metal. I did a few coats, but it's just not coming out dark at all

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Old 08-23-2013, 06:46 PM   #5
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Cold blue is not designed for rebluing an entire gun-regardless of what the package says. It is for touch-up.
It's not even really "bluing" in the truest sense of the word.

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Old 08-23-2013, 07:05 PM   #6
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Quote:
Originally Posted by longunner View Post
I know, I know, this Is an old thread but I need some help! I have an M53 Mosin Nagant that I'm trying to refinish and I bought the birchwood Casey bluing kit as well and the metal seems to not take the bluing as well as I would like. I degreased then I degreased some more then I degreased some more, before and after the blue/rust remover. I made sure to wear gloves as well so the oil from my fingers wouldn't touch the metal. I did a few coats, but it's just not coming out dark at all
Getting a good even dark coat is difficult to do. It will take a lot of time and effort but it can be done.
Use a heat gun or hair dryer to warm the metal before application. Do a relatively small area at a time until you have one coat done. Blend with fine steel wool, oil and Let set over night. Degreese and repeat.
It is unlikely you will end up with a great finish but it can be done.
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Old 08-23-2013, 07:18 PM   #7
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Even if you get an even, dark coat it will wear off easily and it offers no protection from rust.
Painting your gun is a much better option.

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Old 08-23-2013, 07:22 PM   #8
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Painting your gun is a much better option.
agreed. A couple thin coats of duracoat is much easier and effective.
There are also better blueing options but duracoat is usually the best DIY option.
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Old 08-23-2013, 07:56 PM   #9
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I was thinking about doing duracoat or even cerakote. Is there ups or downs between the two?

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Old 08-23-2013, 07:59 PM   #10
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I've never worked with cerakote. The only real issue with duracoat is the dry time. You really Gotta baby the gun for a couple weeks while it fully hardens.



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