Dear Larry, At Radio Netherlands we used a product called "Kool Amp", it is a paste that you rub onto your metallic (in this case copper) surface with a cotton cloth. The paste contains silver and plates onto your metal. If want to prevent the oxidation mix a small amount of organic solder flux (rosin, etc) into denatured alcohol and dip the PC board after assembly, let it dry (this is sometimes called "solder-brite") here is a picture of the process: http://www.google.com/imgres?imgurl=...ed=0CCYQ9QEwAg here is their web site: http://www.cool-amp.com/ Best regards, Jack-K8MA.