I know there are conductive sprays available, but these are strongly coloured due to the metals inside them. I am trying to make a (dry) wooden surface capacitive, but would like to have the feel and look of the wood remain intact. Therefore I would like a spray/paint/ink that is transparent and conductive and preferably also water-resistant.
Does anyone have any ideas or suggestions?
P.S. I'm using it to measure capacitance all across the wood (which is 1.5m in length) so the resistance per cm^3 doesn't matter. It could have a nice effect if the capacitance differential is significantly different at various distances from the point I measure.