On 23 November 2014 at 18:37, Neil wrote: > I'm looking for a conductive carbon coating that I can apply to PCBs > myself, for conductive membrane switches. Or something else > ... > > Just some ideas. I do not know how suitable any of these would be. I've never tried them. Each should have level of conductivity needed. May have degree of wear resistance needed. - Conductive epoxy. - Silver-loaded track repair lacquer which does not conduct unti 'set'. As carrier liquid evaporates silver particles produce conductive strip. I've used this for repair of fractures in flexible carbon tracked keyboard tails. - Stick layer of eg butyl rubber (carbon loaded) to board surface in contact with a conductor. Russell --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .