Bringing this thread back from the dead, I just tried to do the headlight mod on some brand new ebay headlights last night. Got the oven up to 230, and the glue would still not release, yet the plastic was starting to deform. Does anyone have any suggestions on what I was doing wrong or what I need to do differently so that the silicone releases before the plastic starts to get too soft from the heat?

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2006 4.0 SOHC 4x4 Extended Cab XLT 81k
265/75/16 Falken Wildpeak AT3Ws