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My experience: oven set at about 250, except that I forgot that my apartment oven always seemed to burn stuff. I can't say what the temperature actually was, but in practice when cooking (food, not auto parts) I behaved as if it were running 25 degrees (Fahrenheit, though I suppose that's obvious) hot. I'm not sure why I didn't factor this systematic error into my S-modifying adventure.
Result: they did come apart, though with some effort in the prying. Unfortunately, getting them back together was another, impossible task, as the clear covers had been badly warped.
I now run the (painted, and pretty nifty looking if I do say so myself) taillights without clear covers.