To continue our discussion on possible corrosion of a Ag/Cu conductive paint ground plane.

I was at the Sensor Expo today and talked to a company, Conductive Technologies:
http://www.conductivetech.com/product/shielding.htm
that prints conductive patterns on plastic (primarily flexible sheets) for shielding, keyboards and such.  He confirmed my worries about Ag/Cu (silver plated copper particles) in that they are unsuitable for long term exposure due to corrosion.  This company will basically only print pure silver or silver plated graphite (carbon) compositions.  And even though the silver will still oxidize slowly (due to oxygen transmissivity of the paint and plastic overlays), the silver oxide still has 92% of the conductivity of the metal silver. .

Just one more bit of information to absorb.

Regards,
Charles Patton