It needed three coats to be fully opaque. It applied smoothly, but was a little patchy after two coats, so I added the third. My mistake was doing too thick a coat because it actually bubbled a little (this is most obvious on my pinkie). A layer of topcoat smoothed it out, but you could still quite clearly see it. The duochrome effect is amazing, though. It's a very strong, noticeable colour shift. I even got compliments on it when someone noticed it wasn't actually green!
Starts off purple.