This is a surface treatment that is done to all of our cast iron camshafts. It is a phosphate coating that inhibits rusting on the lobe areas. This is done in a heated solution of Parco Lubrite-2. The camshafts are hung evenly on a rack. They are then submerged into the 200' F solution for approximately 30 minutes which will allow appropriate coating. Under a microscope, the surface appears to have "fish scales." This helps retain pre-lube during the break in procedure.