Alex,
E-mail me at dnsac2@aol.com. I just built a pipe burner out of parts from my local propane supplier and it works great. I will send you a diagram.
I use the "Belgium Blue" available from brownells and have great luck with it. I have not used the Dicropan, but have read the instructions and it seems a little more involved. With the Belgium Blue all you have to do is throughly clean the barrel, heat the barrel in the boiling water, let it dry, then carefully swab on the solution and wait a few seconds for it to dry, then back into the boiling water. Remove from the water, then I card it with steel wool and back into the water. Repeat until you get the desired color of bluing. We used this stuff at gunsmithing school and almost always had great results with it. If the job came out bad it was because of poor cleaning or too much solution on the first couple of coatings of the barrel. Do not put so much solution on the pad that it runs down the barrel the first couple of times. After that it does not seem to make much of a differance. Be sure to clean all of the oil off the steel wool prior to use. When you are happy with the blue, dunk the barrel in water displacing oil and your done.
Hope that helps-John K.
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