It's kind of off-topic, but as a paint contractor, I have figured out the best way to stop them, (taggers) is to take care of the vandalism asap. Even if they come back and do it again, as soon as you see it, paint over it. They will eventually get bored and move on. Lol, last week I was working on a tire store and happened to notice some punk kid pull out a marker and start writing something on the light pole of the taco bell. I grabbed him by the shirt and handed him a rag soaked in lacquer thinner and made him wash it off, then I took his marker. It felt good .