The trouble with solder is that the metal has to be CLEAN for it to stick. Brazing alloys are a little more forgiving, as they usually require the base metal to be dull red, which usually means the rust is burnt off.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.