I did the same thing as david 1. 200 degrees for 10 min, then for 8 and the lights came apart. The only difference was I then put the lights back in for 10 and 8 and my lights went together perfect. I then put a line of silicone on the edge. No problems at all. I cleared them 3 months ago and have driven in the rain and washed the car a dozen times since the clearing. Good luck!

 

I have done 4 pairs of these now. Leave the bulb and balast in just take off the rubber backing for the light. Everything else will be fine.

 

I didn't remove it. I think it's able to withstand quite a lot of heat.
-Brandon