I was recently told that I should not use the same kiln for
enameling as I do for burnout.
Alice, one reason (don't know if it applies to your particular case
though) concerns kilns that have exposed electrical elements inside
the heating chamber. These last a long time so long as the element
material is covered by an oxide layer, which happens naturally in an
oxidising atmosphere, such as you would have most of the time when
enamelling. With wax burnout though the wax vapours lead to a
reducing atmosphere which can give early failure of the elements.
Kevin (NW England, UK)