Cold Blue--How Do You Stop It?
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Thread: Cold Blue--How Do You Stop It?



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    Cold Blue--How Do You Stop It?

    From time to time I use cold blue as a touch up, as I suspect many of us do. After treating, I wipe the area off, or run water over it, and scrub with a toothbrush of rag. Then I dry it and cover it with oil. And yet, invariably when I come back after a few days or so, there is fine rust on the area I just treated.

    How do you guys get rid of the cold blue solution and then prevent rusting? My method isn't working.
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    Gun Wizard
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    It rusts even though you oiled it? that's crazy.

    EDIT: Try rinsing in 10% solution baking soda bath to neutralize the acid from the blueing agent. After the bath, rinse thoroughly with water and dry completely. Use a hair dryer if necessary. After it's bone dry, oil it up.
    Last edited by scorpio; 12-29-2018 at 07:37 PM.
    me, Maineiac, cajun56 and 4 others like this.

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    I have not had that problem. I reblued a entire revolver with it and didn't have any rust. I believe the directions say to rinse it off with water after 30 seconds or so.
    Travlin, Maineiac, cajun56 and 1 others like this.

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    I've seen that happen once with a dovetail sight insert. What solution are you using? How fresh is it?

    Blessed are the flexible for they shall not be bent out of shape.

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    Esteemed Sharpshooter
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    What brand is it?
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    Gunfighter
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    Hot, soapy water. Hot rinse. Towel dry, then use WD40 to remove water. CLP for a protective coat. Check it every day for a week, just to be sure.
    94win30wcf likes this.

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    Marlin Marksman
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    I have that same problem sometimes but not always. I clean the area with hot water, dry and oil. I've learned to recheck it a few days/weeks later and rub with oil again. Most of the time if the gun is in my safes there is no more issue. It's only when it sits on my bench which is in the basement that I have this problem and only during the summer when it's more humid. I run a dehumidifier down there durring the summer.

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    Quote Originally Posted by rob42049 View Post
    What brand is it?
    I have several. I have 44/40, Van's Instant Blue, and Birchwood Casey Blue. They vary slightly in the color produced, and the speed of the process, but despite being about 8-10 years old, they all still work. There's nothing in them that would prevent rusting. Indeed the blueing process is rusting. And of course the work must be completely degreased prior to using the cold blue.

    I've always scrubbed the piece off under running water afterward, dried it, and applied oil, but I get rusting nearly every time eventually.
    NRA Endowment Life Member, SASS, OGCA
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    Tinhorn
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    eezox is your friend oil it down and forget about it.never had an issue after reblueing.
    94win30wcf likes this.

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    The best I have found is Brownells oxypho blue. Clean and degrease the metal very good, heat the metal and when the desired blue is reached rinse and oil. A tip I got from one of the Brownell tip books was polishing with brown paper towels. Kroil works very well as a preservative. After all, bluing is just controlled rusting.
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