DIY Painted Wine Glasses. Use enamel paint made for glass/ceramic. When the paint has dried, place the glasses, upside down, on a cookie sheet in a cold oven. Set the oven to 350 degrees. When the oven reaches temperature, set the timer for 30 minutes. When the timer goes off, turn the oven off and prop the door open. Let the glasses cool in the oven.
I decorate wine glasses and vinyl records with them and the are great. if you use them on glass make sure you bake them at 350 for 25 minutes so that it sets the paint to the glass and then just remind users to make sure they gently hand wash. the paint is smooth and bright.