Originally Posted by Andrew R Stewart

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