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Funny! My brothers and I used oatmeal and salt containers.
Yes, if you leave them in long enough (overnight, or a day or so), it will totally remove all of the rust and unfreeze them. I have had parts that were completely jammed to the point that I couldn't close or open them with extreme force. After letting them soak for a few days, they were like new.The best part of this process is that it will only remove the rust, not the good metal. If you're worried about soaking something that's heat treated (because you could develop hydrogen ions in the metal), just place it in an oven @ 400 degrees for an hour after treating.
The problem with using fire to "clean" the cast iron is that cast iron is very brittle, and if there are any flaws in the metal to begin with or if it is heated irregularly or too fast, you can potentially crack the metal, especially a piece as thin as that pot.IMHO, for something as lightly mucked as that pot was, I would have just used a damp washcloth with some coarse salt to scour the pan, give it a washing, and then treat it.
Thank you so much! You just showed me the missing link on why my box cuts were never square (I was missing the spacing block and the guide). You have my vote!
It's also very useful in removing water rings from furniture. Take a dab and rub it in a ciruclar pattern.
Flux for sweating pipes is corrosive (acid based) and will cause the treated area to corrode and turn green over time. I have been told that it would eventually cause pinhole leaks in the pipe, but so will the wrong Ph in water.
That's one heck of a garage sale find! If no one has told you, that's a 1937 S&W 1917 contract model in .45 ACP/AR that was made for the Brazilian Navy. A boatload of them came back in the 1990's (in about that condition).Great Instructable!