OPI Metallic 4 Life came from the Nicki Minaj collection and it's a black based polish packed with chunky silver glitter and smaller bits as well. It took 3 coats for me to get it so the black was completely opaque and so my nails were super glittery! It has quite a thick consistency, so I think you could get away with 2 coats.
It was hard to get a good photo as all the glitter was reflecting all the light - a good thing if you want a super glam nail colour!