Covington's all new Koolerant #4: Glass Specialty should be your first choice for all of your glass grinding and cutting needs! This is a non-foaming, amber colored, oil free koolerant has excellent cooling properties and rust inhibitors without leaving a residue on your glass. Mix this koolerant with water and lubricate your diamond tools! This additive is compatible with both your saws and grinders! We recommend using 20 parts water to 1 part Glass Specialty.