>wax paper but waxing the glass seems like a good idea.

You would like to try that wax they use, when making boats of fiberglass.
(The forming thing they laminate fuses + stuff, my english stinks)

I was working in small boat factory app 15 years ago and nothing sticks in that wax. Ofcourse you know that they spray paint on that wax and laminate fiberglass on the paint.