painting inside of taillights

I remember reading an article about a guy that would bake taillights in the oven and pull them apart and paint the interior of them and put them all back together. I was wondering if any one out there remembers this or if the guy that did it could tell me and small steps that I may want to take. I was planning on buy some altezzas from a friend for cheap and paint the interior of them black to match my car but leave the red light part. any ideas or thoughts???