Cone 6: Mayco's Cone 6 Clear glaze adds a brilliantly clear, smooth gloss finish to your work. Perfect for stoneware and porcelain bodies, one to two to coats is all that is needed. Cone 10: No Change. TIP: Heavy application may increase the incidence of crazing. Reduce the amount of glaze deposited by loading your brush less heavily or decrease the number of brushing coats applied.