This nail polish is amazing for giving the crackling effect and is the best "shatter" polish I have used (I have tried a few different brands).
It is quite fun, and intriguing to watch the polish immediately start to crackle as you apply. The trick is to be quick and use only three strokes of the polish, the more you muck around, the more likely it won't work.
The crackle effect doesn't appear to stay the same as when you apply it. Over 24 hours, it gets smaller and the gaps between get bigger. I found this reduced when applying a top coat over top.
My favourite way to wear this is with a contrasting colour underneath, i.e. gold base with black crackle over top. It looks really effective!
This polish needs to be stored in a cool dry place. Most nail polishes do, but I never used to bother. I found when I kept mine on my dresser, they quickly became clumpy and unusable.
I purchased the OPI shatter polish in white, black and blue when they became popular and I honestly haven't used them very much since. The white one is so strong or the base is so thin that it soak up the under coat color. The black one is okay but is so soft after applying that even after applying a top coat it easily scratches off. The blue one didn't shatter at all which was very very odd. I wouldn't purchase any more of the OPI shatter products and I won't personally use them on my nails again. Positively, when applied it does look good - but as I said, it doesn't stay on long.