Glassline Paints offer the fusing artist a variety of applications--Squeeze straight from the bottle or from a fineline tip, spread and/or mix colors with a palette knife, thin with water and paint- or airbrush onto matte-surface glass, cut in patterns with silicone blades or sgraffito, and fuse to different temperatures to vary color intensity and shine. Oh, and you can layer them and re-fuse for extra depth. Wow! All this, plus they're non-toxic, and work on all COEs too! I've tested all the colors and picked the best and brightest for this website. This product works on regular polished-surface glass when you use a palette knife to apply. Watch our demo video: How to Apply Paints to Smooth Glass Surfaces for Glass Fusing.