Glassline is designed to be fired on or between layers of glass. It is compatible with most types of glass from float to 90 and 96 COE. For best results "tack fuse" individual sheets of glass before stacking you full fuse. A metal tip is recommended for fine line drawings. To airbrush or spray, Glassline should be thinned with water. Best fired to 1500 degrees F but may be fired lower or higher depending upon your desired results. Shake well before use. Clean and thin with water. Glassline is lead free and food safe. Packaged in 2 oz bottles.