@strawCake - I know some graffiti is artistic, but some of it really is just vandalism. I don't have much sympathy for these "street artists." Why don't they just paint on their own walls?
I also think it's kind of sad that someone could get sued for this anti-vandal paint. If vandals are trying to come onto your property illegally and get hurt, you shouldn't be held responsible! That is just ridiculous!