http://www.bullseyeglass.com/methods-id ... icleid=747
Before using a new kiln for glass projects, you'll need to pre-fire it. This burns out binders, moisture, and other residue left over from the manufacturing process. New shelves can be slow to take on primer so we recommend pre-firing them, too...
It's not very long, but I linked it instead of copying it so that if it is ever updated, Forum readers will always access the latest version.