If you don't want to use a oven get a heat gun. If you are watching them then the oven is safe. I think I let mine sit for 3 mind before taking out and came apart like butter
It is, fucking illegal. I've seen the newest Camaro with red halos, but I'm 100% positive it's just for show purposes. Sick, but not worth the trouble from 5-0.
If its visible, federal law says no no. Check your local laws as advised but I'm inclined to think most if not all states agree/following with federal ruling.