Simple in design, easy-to-use Glassline paints are a lining and shading product for glass. Glassline may be applied in between multiple layers of glass or on the surface for a complex dimensional look. To further explore your creative edge, spray Glassline to achieve subtle shading variations. Compatible with most types of glass, from float to 90 and 96 C.O.E. For best results, tack fuse individual sheets of glass before stacking for a full fuse. Best fired to 100 degrees F, but may be fired lower or higher. 28 vibrant colors available in convenient applicator bottles. Lead-free and food safe. Colors are opaque. May be spray painted by mixing with water to suit.