If it's not conductive then make it conductive. I use a product from Peerless/Peidmont Coatings for powder coating MDF (wood). It's Electro-Prep #15-LT-1039. This is a conductive clear coating that you spray on in liquid form and and once dry it leaves a conductive film on the surface. It works for plastic and wood, however be forwarned this stuff is extremely corrosive and has very bad fumes. I really don't recommend it for the home hobbiest but there are other products on the market that work similarly.
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Dale
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