Paint selection is an important consideration when painting a glass candle holder, especially since the glass heats up when a candle is lit inside the candle holder. Regular acrylic paint tends to chip off glass, so paint especially designed for glass is a better choice. There are two types of glass paints that do not require a kiln for curing. These are air-dried and oven-cured. Due to the heat concerns, the oven-cured glass paint is a better choice for painting a candle holder.
Clean a glass candle holder with rubbing alcohol and let it dry. Treat the glass with Delta Surface Conditioner, if using Delta paints.
Tape your pattern to the inside surface of the candle holder, if needed. The pattern can also be set on the work surface and used as a reference.
Empty some paint onto the palette in the colours you need for the pattern.
Apply the paint to the glass with brushes. The paint can be applied freehand, or by copying the pattern.
Clean the brushes with water when finished, or as instructed by the manufacturer.
Dry the paint for 24 hours, then bake as instructed by the manufacturer. For example, the Pebeo Porcelain 160 is placed in a cold oven set to 163 degrees Celsius on the centre rack. Once the oven reaches 163 degrees Celsius, the glass candle holder is baked for 40 minutes. Dick Blick Art Materials recommends using an oven thermometer because the paint will burn and turn brown if it gets too hot.
Delta and Pebeo are two brands of air-drying or oven-bake paint, recommended by the Warm Glass website for painting on glass.