Painting martini glasses with special enamel paint is an easy way to decorate stemware. It takes about 20 minutes to prepare the glass, 20 minutes to paint it and four days to cure it. To complete the project, you need the stemware, some rubbing alcohol, enamel paint made for glassware, a disposable plate, a printed pattern, paper towels, sponge daubers and a variety of flat and pointed bristle brushes.
Prepare the glass
Wash the glass with soap in warm water to remove any surface material. Rinse the glass, and allow it to dry. Add rubbing alcohol to a paper towel and wipe the outside of the glass, then allow it to air dry for 15 minutes.
Choose a printed pattern
Select an printed image to use as a pattern, preferably something with simple shapes, such as grapes or cherries. The image can come from a piece of clip art, a design found on the Internet or even a coloring book, as long as it fits the glass.
Place the pattern inside the glass
Trim the pattern from its sheet and place it inside the glass, with the printed side facing out. Add some crumpled paper towels behind the pattern to hold it in place.
Paint the image
Squeeze dime-sized dollops of paint onto the disposable plate. Use the brushes and the daubers to paint the image on the outside of the glass, using the pattern as a guideline. Choose daubers for round shapes, such as polka dots or flower centers. Do not paint the top ¾ inch of the glass because the paint should not come in contact with beverages, according to Plaid.
Cure the glass
When the painting is complete, set the glass aside to air dry for 24 hours, then heat-cure it to protect the painted image. Add the glass to a cold oven, then turn the oven to 350 degrees Fahrenheit and bake it for 30 minutes. After the time is up, turn the oven off and leave the glass in the oven until the unit is completely cool. Remove the glass and wait 72 hours before using it.