The first mani I shared on Facebook, and here - a magnetic diagonal line. The magnetic mani is nothing new, but I'd never done one before. Well, this was the 2nd try, I think. You have to be careful not to get the magnet *too* close, or you'll get polish on it. Not close enough, and the design doesn't come through. I think your best bet is to put one thin layer of polish on, let it dry, then apply the 2nd layer and use the magnet on one nail at a time.
Even if you don't use the magnet, the polish is really pretty, and China Glaze makes a nice polish.