This polish is one of the One Coat Glitters from Milani. It really is one coat for full coverage, though it will have to be a very thick coat and take forever to dry! I have had better luck with one very light coat, let that dry for a minute or two, and then follow up with a medium coat.
Note that the amount of glitter in this polish means it will be somewhat bumpy once dry. I recommend checking out a thick top coat to even things out, this will really help with the shimmer! My favorites are from Poshe and Seche Vite, though I’ve heard the Gelous base coat (available at Sally’s Beauty Supply) works great for this as well.
To help remove such a glittery polish, try the foil removal method that I mentioned in my CND Shellac post.