Quoted from mbaumle:On the copper traces of the PCB--but only a very thin layer. It's kinda the same principle of smearing the same stuff on the stepper units of an EM. Super thin layers just to keep the wear down, and everything operating smoothly. Using teflon lube keeps dirt from sticking and getting everything gunked up.
The lube is the key. A good dielectric synthetic grease and you should be good to go