This sounds like it is

Stephen Richard

This sounds like it is coming from under the glass.  The shelf may not be flat, there may be some small divots.  In any case, the air is not able to travel out from under the glass in these areas.  If all else fails, put 1/2 mm fibre paper down and then thinfire over it.  This ensures the air can get out from under the glass.


Stephen Richard

blogs at: and

People Who Like Thisx