Graffiti Vandalism

Just when all was going well some moron (or morons) graffitied one side of Clarabelle. I can't describe how angry, frustrated, disappointed and sad I feel about this. Years of hard work spoilt in one night by some semi-literate coward with a spray can. Yes, it can be patched up and painted over, but that's a whole lot of extra work I didn't need.

If anyone has any suggestions as to how to prevent this from happening again, I would really like to hear them.