At school in the RM rooms, they have a really thick, hard wearing paint on the ends of most of their tools (Squares, hammers, chisels, QCTP holders, etc).
At one time the police had a website where we could put in all details about our valuable equipment, they could then check serial no's etc if an item was stolen. Don't know if that site is still going or if it had been any success in finding anyone's stuff.