I stopped by Sephora this past Friday and immediately saw the magnetic nail polish. I went ahead and shelled out the high price of $16 for the silver polish aka Trafalgar Square.
The first time I tried it, I did not hold the magnet long enough over the nail and got a bad result. The result was getting a black splotch on the nail because it takes 10-15 seconds to fully form the design.
I also took too long to put the magnet up to the nail. This shit drys super fast (20-30 seconds) so good luck! I finally got the result that I was looking for when I tried again tonight.
Paint a base coat
Paint one coat of the magnetic polish.
Let that dry.
Paint a generous coat of the magnetic polish and IMMEDIATELY place the magnet above the nail.
Paint a top coat.
I did notice that if I tilt the nail the silver areas move kind of like in holographic stuff.
Con: This stuff chips pretty easy. After wearing it two days it was chipped enough that I needed to redo it. It drying so fast makes you need to act fast or else you will have to redo it. Also placing the magnet directly above the nail lets you easily mess up by putting it too close and getting nail polish on the magnet.
All in all I like the effect when I actually get it correctly. I think it is kind of worth the money considering I love the silver color even without the magnetic effect.