These two pictures are of the vase before. What you see is a film that stayed on the glass from it's previous life as mercury glass. I just cleaned it and did not bother removing the texture.
I wrapped the outside of the vase with tape and newspaper. The spray paint I used was Rustoleum Metallic silver and a can of gold spray paint my mom had.
The first step is to lightly spray the inside of the vase with the silver paint. Before it dries, get a cotton and lighlty dab the inside of the vase randomly. Once you have done that, spray the gold color lightly. Mercury glass is not perfect, so don't worry about it being perfect.
Here is my finished vase, I don't think it really looks like mercury glass, but it does look interesting.
This is what the inside of the vase looks like.
Here it is with my lovely orchids. In front of it, is my mercury glass owl that I found at TJ Maxx, and that is where you can really tell the difference. I'm thinking that maybe more gold could have come through the vase to make it look more authentic.