UPDATE 03. JULY 2011 - I applied a thick layer, as recommended and here are much better results:
|p2 Color victim nail polish 010 glamour, Essence nail art cracking top coat 01 crack me! black|
You need to apply a really thick layer of the cracking polish to achieve the result, I had a number of unsuccessful attempts before I got this lovely result.
However, the white crack polish does not seem to as effective:
|Catrice 030 Meet Me At Coral Island, Essence nail art cracking top coat 02 crack me! white|