Uro's and glass

most any paint should adhere to glass the messed up part is even after clear coating paint is easily scraped off with a rezor blade glass is way to smoothe but for a painting thats going to hang on a wall they should be fine
There was a fad back in the 90's (mostly involving the mini truck scene) where a lot of enthusiasts were having their club logo painted on the back glass of their trucks. The majority of these were brushed on with One Shot (after the glass was thoroughly cleaned with an ammonia based glass cleaner). Occasionally, highlights were airbrushed with urethane and candies can be used over the One Shot too as long as you mix a little of the One Shot catalyst with your urethane to prevent wrinkling. The murals would last a few years if cared for properly...