This clear paint called Whitey, turns just about any surface into a white board and so that also means that a corridor could be painted with this substance as a preventative measure against graffiti as anything written or drawn in erasable marker can just be wiped off!
These are the details for the Whitey dry erase paint;
Whitey dry erase paint will magically turn your wall into a dry erase surface. It is CLEAR, so it will not change any wall colours! Every order includes 1 dry erase marker & 3.38 oz. liquid cleaner.
Prices start from $75 (£47), which covers around thirty square feet!
Source [Geeky Gadgets]