For this wine glass, I place the clay right onto the glass. I tried to interlace the clay so that even if a little part detaches from the glass, it will all stay held together. Place it in the oven while the oven is pre-heating, and leave it in another 30 min. after you turn oven off. Wash by hand and pat dry with a paper towel.
Polymer Clay Workshop 
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beautiful:-)
i probably will never be able to do wine glasses they wont fit into my little polymer clay oven. do you know a way I can cook it in my normal oven without having to scrub down the whole thing?
I completely tent mine with tin foil. I don’t think any fumes escape, but no promises…
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Such a neat idea, what temperature would i set my home oven to?
Thank you! I set mine to 260 dregrees. The best thing, though, is to check the instructions on the clay package. There is no special consideration for the fact that it is on glass.