Can I just say that this is my fifth - FIFTH - day wearing this mani?! Woah. A moment of silence for such unheard of awesomeness. I'm hoping it's the Sephora by OPI quick dry top coat that I'm using for the first time.
Two nights ago I added $OPI It's Real 18K Gold top coat to my Guerlain Riviera mani. I used two coats of the 18K Gold and followed with another of $OPI quick dry top coat.
If you are wondering how similar it is to the Rococo Gold Leaf lacquer - Rococo's has much larger pieces of the leaf. Based on what I've seen so far, I'd recommend using $OPI's over dark colors, and you'll probably want two coats as well, followed with clear top coat. It's a little bumpy on it's own.
P.S. I think everyone here knows, but when I write "$OPI," it's just a shorthand for "Sephora by OPI," that I learned on MUA. :)