Hi Sweetearth, Your questions are well founded. Perhaps there's some safety info at the glassattic URL below that might prove helpful. Most of the info appears to be older, so that might be especially helpful when researching the safely concerns of the older PC. I would be concerned if there's any chance on a young child sucking on a cured piece of the doll house furniture, but then I tend to be very cautious with potential health issues in general.
I did find the following info in my "magic archive" from Donna Kato
Donna Kato from
3. Plastics of any sort emit fumes. When you buy a new car, you'll notice a fine film appears on 3. Plastics of any sort emit fumes. When you buy a new car, you'll notice a fine film appears on the windows inside the car. Polymer clays are no different and so, I wouldn't recommend making aquarium items and exposing live creatures to this phenomenon.
Anita in AZ