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Interesting, I was told to do it with cold water, anyway, I will give it another go and perhaps get some acetone to give it a good rub down.
I wonder if there was still a bit of oil on the barrel...

I have been trying to touch up a rust spot on a shotgun of mine with cold bluing, I was wanting to get oxpho blue as it's supposed to be the best on rust but no one seems to stock it and the...