Painting with enamels
For me, I think the biggest key was that you can’t really “paint” as you would traditionally. You have to use the brush to pool on the paint, and then push/pull it into place to get good coverage.
If the glasslines thicken up, they can be thinned with water. Just add some water, shake, and let sit overnight. Then shake some more . Many people toss them when they dry out (needlessly).
Jester’s Baubles Fused Glass Designs