I use automotive clearcoat, it dries on everything I've used it on. About 8 bucks for a rattlecan at oreillys . Very gloss finish , but if you want matte , get a can of wheel coat matte finish and give it a coat or 2 .
I only put a couple coats on the flat of glass, cause I worried about the finish stress cracks like the old Bears get. So far, none, I reckon finish is better than way back when , and it isb't 40 years old either...