I've had this polish for a while now but never really used it. I was too afraid it would look like those crackling polishes which I usually dislike. Well it doesn't!
This is the black Go Magic Croco Coat Effect Polish from Alessandro. The set came with a silver base coat and a special(?) top coat. I've seen the Croco Coats without the sets these days and they have some pretty great colors to choose from. But black is perfect for a start.
I chose Stargazer Chrome polish in Gold as a base coat and I guess you could use any nail polish you like. You have to pay attention to two things though: The base coat should not be completely dry when you apply the Croco Coat. Otherwise nothing is gonna happen. And you should only apply a thin Croco coat over your base coat. Don't worry about it being sheer, it worked just fine for me!
Afterwards I applied one coat of the Alessandro top coat. I'm not sure if you could use any other top coat. I guess it would work though and I'm definitely gonna try it since this top coat resulted in pretty bad shrinkage (I repaired it with black nail polish for today). I added two coats of BTGN Top Sealer, one to even the surface and one after repairing the shrinkage.
I like these so much more than the crackling polishes!