Radio Shack used to have a etch resist pen. I don't know if they still carry those, as I have two old ones that I still use. Tim Daugard AG4GZ 30.4078N 86.6227W Alt: 12 feet above MSL http://home.sprintmail.com/~daugard/synth.htm http://home.earthlink.net/~synthfred/h_toctop.htm (Fred's online edition)