Glass Painting – Water Colors: For use on clean, oil-free, vitreous surfaces. Colors can be used straight from the container using water or a gum solution as the solvent. Colors can be diluted or intermixed with other colors. Each color is sold in a ¼ oz. container.
The Glass Painting Powders will attach to glass at 1250 degrees F. They will gloss between 1300 and 1400 degrees. F. They may be taken up to 1450 degrees F. without loss of color. Firing times and temperatures are only guides. Your actual experience may indicate the firing may need to be more or less time and temperature.
You may want to vent your kiln as it heats up to allow for any painting medium fumes to escape kiln.