Hooray! I got my Black Spotted from OPI which I am super excited about! I don't think this is bad for a first go, I definitely want to try something different with it though, maybe over a gradient, or a mixture of colours.
You have to apply it really thinly, like ridiculously thin as if you've got no polish on the brush, it's quite watery/oily when you apply it and it "spots" straight away, whereas crackle takes 30 seconds or so to crackle. If you apply it too thickly, it won't really work. Anyway, I am quite liking this, and will be back with more, soon!