Burning out polymer clay is a bad idea. It’s been explained to me
that the stuff is basically PVC. You shouldn’t even breathe the
fumes when you’re baking polymer, so the fumes when burning it out
would be really bad.
If you really like it as a model making material, why not try
sculpting wax? Or, make your model in polymer and then make a
silicon RTV mold of it.
Chicago area, Illinois, USA
Metalsmith, Certified PMC Instructor
Studio 925; established 1992