My kiln lid is cracked and drops dust onto glazed ware.

Position large ware on the lower shelves and smaller ware on the top shelf. Arrange the smaller pieces so they are not directly under the crack where the dust is falling. You could also fill the firebrick crack with ceramic fiber. Roll the fiber and press it into the lid crack with a knife. This method works only with wide cracks. Sometimes dust comes from kiln coating that has been applied too heavily. This is easy to recognize by the tiny cracks in the lid surface. Sand the lid, vacuum, and apply a new coat of Kiln Coating. Please handle the lid gently. Dropping the lid causes cracks in the firebricks.