Yes, you can use chalkboard paint directly on glass!
We feel that a wax based sealing agent is the best option for use with chalk paint and most wax products are just applied with a brush keeping everything simple. The cheaper, low quality wax sealants on the market are usually a total waste of time and can often cause more problems than they solve.
The Chalky Finish For Glass is an ultra-matte paint specifically for glass. You can distress it and bake it. When you bake it it becomes a permanent dishwasher-safe finish.Sep 13, 2020
acrylic enamelAt least three types of paint may be used on glass: acrylic enamel, acrylics marked as suitable for tile or glass, and specially formulated solvent-based paints. Your local store is likely to carry a range of options (view example on Amazon).Nov 10, 2020