Originally posted by: RaiderJ
You should learn some gang symbols and spray on the rival symbol over what's there. Maybe it'll piss them off and they'll wipe each other out?
Ok, that one is pretty clever, but if this kid is a member of the crips and the Latin Devils, he may be the rival gangs.
It can't be that hard to set up a motion sensor camera and floodlight. You could also adopt a noisy dog as has been suggested. I really like the idea of spraying them with dye, but it would be even better if the dye shone brightly under UV light and didn't watch off. Cheaper than paintball would be a supersoaker filled with iodine. However, it may be more effective to put some sort of moat of dye that will mark their shoes, then you'll get clear footprints when they hit the sidewalk, something the police can use as evidence to back up the camera. Plus they may not think to wash off their shoes. If you want to catch them and make them pay for the fence, you need a camera and dye trap.
You could also set bear traps next to the fence, but check to see if it's legal in your state.
If you just want it to stop, you can get a cheap fake camera plus rig a motion sensor light. In fact I would suggest getting a fake camera in addition to the real camera, and make the fake camera more visible to them. I believe there are a ton of wireless cameras that can transmit images to your computer and be put on motion sensor setting.
All that said, it's just graffitti. It's not like they killed somebody. I agree that you should have the right to catch them and have them pay the cost of damages as well as the cost of the camera system, but killing them is a bit extreme. I'd write "suxors" at the end of what they wrote, but I'd write it in something easy to wash off.