How about a micro-coating. Not applied like paint, deposited on the surface like an integrated circuit layer, microns thick. SUre you can still call it paint, you can call the layers of an integrated circuit paint but its deposited differently, is a differnt industrial process, mechanically different, different thermal characteristics, lots of things. More significant in my original comment was this: the color can be "dialed", kind of like "digital color". Paint is imperfectly mixed material with wide color/reflectivity variation over a surface. This new method of coloring a surface is uniform. Imagine the efficiency of a color filter, absorbtive surface, radiative surface etc if the optical properties could be tightly controlled over a wide area.