Cable insulation, graphene, electron flow... how does it work?

From my limited experience with graphene pasted on fuses, it appears to work when painted on the glass only. And I know that graphene painted on the exterior of capacitors can help improve sound quality, presumably by facilitating electron flow to and from the capacitors. I know graphene works on any exposed wire or solder joint. It also works when painted on the insulation of cables. It does not control vibration to my knowledge. Therefore, something crazy is happening whereby the graphene is facilitating the flow of electricity, even when applied outside the insulation.

I want to treat the inside of my old preamp with graphene paste, and I want to try it on insulated wires connecting the tubes and transformer. But there are places where one insulated wire touches another. If the graphene is really operating at some level outside the insulation (and I'm not claiming to know for certain that it does), would it cause a problem if the insulated wires are touching and coated with graphene?