In my experience the external dag (deflocculated Acheson graphite) coating on the kine needs to be present and grounded in many television sets, as electrostatic radiation of horizontal sweep signals can raise havoc with other circuitry, causing sync instability, undesireable images on the screen, etc. But in some sets I found that it didn't seem to matter much that the coating had all flaked away. I suppose that the "doorknob" capacitor found in the doghouses of most sets would sufficiently filter any such trash, but I guess not in some cases....
The conductive coating used to be available through General Cement--in both aerosol and brush-on forms, IIRC. Not sure where one would get the stuff now....
