time was we ( finish industry folks ) would simply use pigmented nitro. this could be still be valid if, and only if, the painted surface would not be exposed to potential handling; i.e. 'mirrored' coffee table or framed so that the paint is against the wall, etc. if the painted glass surface is in a vulnerable position, such as glass framed kitchen cabinet doors, I have taken to using a catalyzed urethane barrier coat cut 50% +/-, allowed to dry, lightly scuffed and then painted - typically cv, and one could use basically any coating. works like a charm.
If you need the paint to adhere well for a long time the two best choices I know of are Glassprimer Glass Paint and Matthews 1-Shot.
They are both pretty expensive, but worth the cost if you need them to last. My personal favorite is Glassprimer because you can order it to match any color from any brand of paint. You can also get custom matches if needed.
I know the Glassprimer is strong because I used it on large glass doors and glued the hinges to it. The paint holds the weight of the glass doors with a very large margin of safety. Here's a picture...
Like shenendoah said, if peeling or scratching aren't a concern, then you can use pretty much any finish. I've used acrylic lacquer on glass that was enclosed on the back and it worked fine as long as the glass was installed carefully.
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