Quoted from Marvin:If this isn't the stupidest thing I've seen done on this site it's clearly in the team photo. This is up there with powder coating a shooter rod.
As said, clear coat negatively impacts the conductivity of the mech. Making sure the unit is clean and functional is good enough. The only time I would advocate going whole hog on polishing it to pure beauty would be when making a transparent machine. Otherwise, nobody sees the innards.