1) Talk to him in private (seems you did to no success)
2) Talk to him as a group
3) Involve superiors and make it official
These are about the steps i'd adhere to for almost all problems.. when you get to point 3 you have basically exhausted all possibilities to settle the problem without much public fuss and shouldn't beat yourself up about if he gets in real trouble with the superiors.
If he's that disruptive to the work environment your superiors need to act because if something happens (you damaging those cars for example and the investigation turns out the guy was a major disruption) it's their ass on the line too and judging from experience bossess don't take it lightly when you hang them out to dry.
2) Talk to him as a group
3) Involve superiors and make it official
These are about the steps i'd adhere to for almost all problems.. when you get to point 3 you have basically exhausted all possibilities to settle the problem without much public fuss and shouldn't beat yourself up about if he gets in real trouble with the superiors.
If he's that disruptive to the work environment your superiors need to act because if something happens (you damaging those cars for example and the investigation turns out the guy was a major disruption) it's their ass on the line too and judging from experience bossess don't take it lightly when you hang them out to dry.