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+1, Bill. I have read about dozens of magic cold blues, and tried a number of them. They just plain are not durable. Some makers advertise them as "used by gunsmiths", which is true but they don't say that gunsmiths use them only to touch up a screw head or darken a front sight, not for a full reblue job.
The only blue that can be done at home that will be durable is rust blue, like was used on many guns prior to the middle 1930's.* It is tedious, and it is best to practice on some scrap, but rust blue will give good results. However it is not suitable for a touch up job, nor is tank blue. The gun has to be taken down to bare metal.
Today, many gun owners use a paint of one form or another; they give good results but never (IMHO) equal the quality of a professional blue job.
Now, my advice is that unless that gun is really bad, with only a little blue left, don't do anything. If it has 60-70% or more, leave it alone.
*WWI era Lugers and Mauser rifles are good examples of rust bluing.
Jim
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