Have you tried Krylon's Looking-Glass spray paint? It's an easy way to make faux-mercury glass decorations for the holidays using inexpensive pressed glass.
Although I had lofty ideas of painting plastic pumpkins, for successful results the paint should only be used on clear glass objects like bowls, vases, picture frames and candlesticks. When sprayed on the reverse side of an object, the paint dries to a dull finish then reflects a mirrored-like shine on the opposite side. (This product is for decorative use only and should not come into contact with food.)
Pictures of my before objects...nondescript pressed glass, rarely if ever used...
|before - pressed glass bowl|
|before - basic candle coaster|
Spray five light coats, allowing the paint to set one minute between coats. The picture below is after the first thin coat.
The next picture was taken after five coats.
|after fifth coat|
According to the instructions, let set one hour before handling. I recommend even longer as the paint rubbed off a bit on my fingertips after an hour. (The Dallas heat and humidity may have added to the smudging...)