I have painted the inner headlight bezel on a few cars, I preset the oven to 170 and left it in there for 10 mims and got it apart.
Just a FYI ( and I havent read the full thread so this could have been mentioned already) but when you car goes to a bodyshop to be repaired/painted, lets say there painting your doors, so your headlights are still in the car as opposed to a fender where they would remove them (at least a good shop would ,
ty shops would mask them), after you finish spraying your clear, you "bake it" which means they turn on a bake cycle to harden the clear, which can be anywhere from 150- 180 degrees, putting your lights in the oven is not going to damage a single thing unless your above that range and leave it in there for too long. Another good thing to do is clean your headlight covers prior to putting them in and dont touch them with your bare hands prior to putting them in, use gloves or a clean towel. If they are left in for too long and you have had your sweat dirty greasy hands on them, it can create a hot spot ( just like how you dont put your fingers on a light bulb your installing) and create cracking or crows feet in the lens.
Just figured id mention that for all the people who were worried in the first 5 pages, or worried with there HID'S as they get baked at a repair shop in the booth as well, the only thing with HID'S is tue wiring that could be damaged only by disassembling or reassembling. HID's emit far more heat than 170, so the wont get damaged by the heating process.