I Have used several lbs of Fos-Flow. It doesn’t initially look like
copper after it is applied. However with a little finishing(sanding,
buffing, grinding etc) the copper color is returned. It is still a
very high temperature solder and you can melt stuff if you aren’t
careful. Also it will patina slightly to significantly different
depending on the chemistry of the patina.
Jim
James Binnion
@James_Binnion
James Binnion Metal Arts