In general low fire glazes are used on earthenware clay or slip cast bisque. On 04 bisque brush on three FLOWING coats, allowing each coat to dry. (otherwise if the first coat is wet you will be wiping it off). A criss-cross pattern is recommended for even coverage.
When dry fire to cone 06.
Read the labels for specific product information. Many glazes can be fired to cone 6, check the lable.