I use copper tape as a preferred method, the stuff I use has the conductive sticky backing 50mm wide I can cut it down to whatever sizes I need, it works well for soldering against for carrying ground wiring. The paint type conductive I have never used but believe its a very good option especially where pickup pockets are visible, black type conductive paint looks better than shiny copper tape sitting in the pockets. There are a few alternatives, I decided the copper was better for the solder side of it rather than aluminium where solder wont work.