We feel that the best way to cut through clay is with a blade. With general use of the sharpened edge cutting straight through the clay, the particles in the clay should help keep the blade sharp. If you drag your blade across the clay you might find your tool has lost it’s initial bite.
These Diamond Sharpening Burrs are just the thing to refresh and old blade. Use this burr bit with a Dremel, flex shaft or drill that will hold the 1/8" shaft. The burrs have a fine coating of diamond dust, so they cut quickly and smoothly. One light pass over the sharpened side should be enough to resharpen most blades. Be sure to use the burr on the beveled edges of your tools.