Experimentation: Spray Painted Glasses, Cutlery and UV Marker
I spray painted a wine glass and a highball glass in white matte spray paint because I couldn't write on the gloss version. It took a bit of time as I had to wait for layers to dry before doing another one, but I was actually pretty impressed with how they looked - the spray paint was really smooth which made them look more professional and allowed a plain surface to be written on.
I tried both pens, the permanent marker didn't smudge whereas the other pen did, but it did show up better - so I'm a little torn which to use. I'll probably use the permanent UV marker as it will be easier to transport rather then the pen that doesn't set.