I found some useful tips for that to opt for glass paint or enamel paint to adhere better to glass and provide a durable finish. You also should use small and fine-tipped brushes for better control and precision when painting delicate designs on crystal glass. Moreover, if you plan to use glassware for functional purposes, such as drinking glasses, consider applying a sealant designed for glass painting. This can provide additional protection to the painted surface and make it more resistant to wear and tear.
