It is better to wax the bottom if you dip and glaze the objects to prevent the glaze from getting onto the part that touches the kiln shelf. If you brush and glaze, you need not wax it because you can control where exactly you are putting the glaze. You can use a soft bristle brush and follow the manufacturer’s directions for the product you are using. Let one coat dry before applying the next one.
If you are using pyrometric cones or a pyrometer, skip this step. ~~ Check on the ware every 15 minutes or so after you’ve been firing for about 45 minutes. You’re looking for bubbling in the glaze. Once it starts bubbling, you’re about 15 minutes away from “Raku Time!”