A PMC banana? Oh boy, now I've heard everything. I would not try to
torch fire this thing. And if I did, I would have a friend and use
two torches at a time.
I'm concerned it may collapse upon firing, because of the
hollow-lack-of-banana-ness inside. I would fire it on a bed of
vermiculite in a kiln.
Holes to evacuate anything are not necessary.
At one point in the firing the PMC is so porous that any steam just
goes right through.
You'll need a very slow ramp speed to burn off that banana peel.
Yeah, you've gotta do this with a kiln.
Good luck, and please post a picture when it's done.
I would also suggest you email tech support at
and see what they have to say.
Metalsmith, Certified PMC Instructor
Hard to Find Tools for Metal Clay