The VBS Board paint is simply ideal for painting Paper, cardboard, wood or metal. But even on glass, the unique Board paint. Simply apply 2 - 3 layers crosswise and let dry for 24 hours. Afterwards your glasses can be written on with chalk.
Extra tip: Clean your glasses before applying the paint so that they are free of grease and dust. This ensures optimal adhesion of the paint to your glass.
The VBS Board paint is made on an acrylic base, it is water-dilutable, but dries waterproof. The paint adheres very well to the glass, but can be removed with a little rubbing. So you can continue to use your glasses normally.