Tap Magic protap is an outstanding high performance cutting fluid that's 100 percent biodegradable and totally free of all regulated chemicals. You can use this cutting fluid with complete confidence for any cutting operation on any metal. It provides excellent performance for hard metals such as stainless steel. And it will not stain or otherwise change the properties of even soft metals such as aluminum. Regardless of the cut, heat dissipation is rapid and the resultant finish is ultra-fine. Clean up is easy too.