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I have just finished translating and re-editing the Polymer Clay brief material I had produced in spanish. I expanded it to include polymer clay brands that are found in stores in the U.S.A., and added book and website resources. Give it a read and share it please!
Anyway, thankx again for any help!
Here's an idea:
For an armature, use a cardboard setup. Of course, cardboard is not that durable or sturdy, but it'll Block out most of the shape. To get this to harden well, Use "Bondo". You can find it in autozone or any place where they sell car manteinance or care products. Bondo is a polyester putty that hardens in minutes after you mix it with a hardener cream. It's VERY cheap. Use it to build up on the cardboard box to get a hard shell.
Be careful though, bondo IS toxic. Use a respirator mask to avoid health issues. Use a spreader to apply it, a little at a time (it really hardens fast)
After that, Sculp over bondo. Since Polymer clay is not cheap, I would recommend actually just making the cake details in polymer clay, and leaving the large parts to either bondo or other cheaper clays (there are many air-dry clays that can serve that purpose). Bondo can also be sanded and given form, just remember not to inhale the dust.
Let me know if this helps.
Bondo is easy to find almost anywhere. If you don't find it by Brand name as "bondo" you can always use a generic term like "polyester putty" or "Car-Filler putty"
On a side note there is still a bit of spanish appearing in the FAQ Part Two, under the "after cooking, crack have appeared" bit, on the first bullet point.
And yup, it has some stealthy spanish inserted, People have already mentioned it, I'm just waiting to finish a new section on using polymer clays for jewelry to upload a third edition manual with that correction.
second column first bullet
remember you can actually tint sculpey liquid too to use in molds, that might also be a good idea.