I painted my nails first with CND Blackjack and OPI Alpine Snow. I added a top coat of Seche Vite and let it dry BEFORE adding Cracked Concrete. Some people find it easier to use a crackle/shatter coat on wet (or slightly wet) polish, but I find it better over dry.
As you can see, it crackled nicely! I used a thin coat that covered the entire nail in 3 swipes and this is what I came out with.
It's a lot like China Glaze Recycle for its base color. No yellow tones (yay!) and no red tones (yay again!) but just a nice grey.
Indoors with the flash - not much else to say here. :] If you're into grey cremes, I'd say get it!
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