So vs. bricks and crap, great idea.
Most of the stuff we tag though, is already painted. Meaning they laser off all the paint with the heat/sound energy, then the paint is gone. Meaning they have to paint over it again. So the logical thing for them to do is just paint without using a laser, seeing as they end up painting either way.
Hahahahahaha this is a terrible way to get rid of graffiti.