I am SO glad I tried it! The new paint made for a super shiny mirror-like finish, and I think that I really love the new glass better than my original pieces. In these photos, the square vase was made using the original method, the small votive holder has one coat of Looking Glass paint, and the cylinder vase has two coats.
You can see that the glass gets shinier with each coat of paint, but don’t forget that you will also have to spray your water again before each additional coat of paint. I used a 50/50 mix of water and vinegar this time (based on a tip from a reader!), and I like that it produced more irregular shaped blotches instead of just water-drop spots. I waited until the Looking Glass spray paint was tacky, and then I used a paper towel to very gently blot the water inside of the glass.