i just finished watching a show about greenbuilding on this show called eco tech..a scientist is developing a paint that is graffiti proof..stengthens concrete and has nano particles in it ans hardens to near diamond hardness...it does some other things as well that i cant remember..it also said if u paint a house with it would last 1000 years..i know it sounds good to be true and why exactly 1000 years right but it was still interesting..he showed some of the test patches he had already painted..i wish i could remember his name but its a real unusual name..i want to say his last name was bolaragu or somethin like that