I set the oven to 230F, but next time I open them I think I'm gonna do 250F. That sealant is some heavy duty ****.
Chrome paint on the back side doesn't reflect worth a damn. Plus it won't want to stick to the polystyrene without primer, which would block the chrome paint anyways. If you want any reflection at all just get mirror foil and put it on the backside so the reflective side is facing out of the headlamp. Then just take foil tape and tape it down. Or if you don't really care that much about reflection but want some, just use foil tape alone. I tried it and decided to not use any at all.
