Basecoat: Salon Sciences Instant Artificials (1 coat)
Color: China Glaze Skyscraper (4 coats)
Topcoat: David (1 coat)
My bottle of Skyscraper is really thick and sticky. I may thin it but I actually didn't have too much problems with application. This took four coats for an opacity I'm comfortable with. The surface dried totally not gritty at all - I didn't need to use Gelous, just one coat of David was enough for a totally smooth texture.
I don't know whether this is a dupe of Essie SSN - I've never seen it in person - but I think this is probably close enough for me. I own the Fing'rs polish that's supposed to be a dupe - but just in pictures, Skyscraper fits closer to my idea of what SSN looks like in real life.