sounds to me your target audience may be some of the building owners closer to the high crime areas (ex downtown la) it is cheaper and smarter to just paint the building in a color thats primiarly available anywhere and just repaint it yourself or have a staff member do it nice idea but most cities will do it for free.i know in palmdale they are on it fast for free we just have to call
Here in town if its up more then 48 they fine you like 500 ish... after a week they come out and "paint" it then bill you around a grand....Which is why I Have been thinking about this latly.