rkopf-

Thank you for the temps. My nylon spool is due to arrive today. Can't wait to give it a try.

I found the same trick of using a glue stick (Elmer's purple) on glass to be most effective. Bought a 5-pack for $4.99 at Staples. In fact, I have found it more effective over kapton tape or painter's tape even when using ABS or PLA. The trick is a thin layer (as you said) but you must put it on when the glass is cool if using a heated plate. I'm surprised more people aren't using this method over kapton or tape.