Sucks! Seriously what is the point of it, water runs off it sure, but the dirt sticks and bird **** turns to tar. And worst if all you can't use a scraper on it or it will scratch the coating. Had two glass atriums I cleaned earlier on a flat roof, had specks of paint all over them, nothing I could do as they had a self-cleaning film all over it so couldn't use a scraper. Lets all lobby that self-cleaning glass should be banned!