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I would not use any oil or the like on a frame that I was going to paint later. Have done that and been reprimanded by a couple painters. I use a phosphate solution (Navel Jelly) to reduce rust during the process. A good painter will use much the same after prepping the bare frame for paint and some primers contain a rust reducing phosphate component.
Nice looking brazing and the ultra sonic dip isa cool idea. Andy
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AndrewRStewart