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Topic: Polymer over Air dry clay  (Read 1694 times)
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« on: February 16, 2013 08:34:42 PM »

I've begun making League of Legends piece for my boyfriend's friends and I need to make bases to attach the polymer sculptures and odd and ends to. I was wondering if I could make like a say a dome out of Stonex or Marblex, let it dry, then cover it with polymer and bake it? It says not to kiln it on the package but will it matter after it's dried? I just don't want to waste a ton of polymer on bases
Addicted to cute and tiny things
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« Reply #1 on: February 18, 2013 10:26:11 AM »

I think your best bet is to make a dome armature out of aluminum foil and cover that with polymer clay to attach your sculptures to.

Be strange. Be weird.  Be geeky. Embrace cuteness =)

***I don't do personal swaps - I was flaked on and it was not a great experience, however I am open to commissions***
Diane B.
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« Reply #2 on: February 26, 2013 02:05:51 PM »

You can use any material under/inside polymer clay that can take the low heat necessary for curing polymer clay (around 275 F).  Those armatures inside the clay will also be insulated from direct heat and so not get too hot as easily as the clay outside.

Air-dry clays and papier mache, etc, are commonly used as permanent armatures under polymer clay, but not sure how much "stone" or other kinds of filler Stonex has in it, etc, and stone might expand or contract a bit during heating/cooling and cause cracking in a polymer clay covering.
(You won't heating the air-dry or polymer clays or the armatures to really high temps by kiln-firing,  so no worries there.)

You might want to check out some of the pages at my site for various ways to make "bases" and also materials and methods for using permanent armatures of various kinds of materials under/inside polymer clay (there are others besides air-dry clays like the wadded aluminum foil mentioned, or wire mesh or "Styrofoam," etc):
http://glassattic.com/polymer/sculpture.htm (click on Settings & Bases for Sculpts)
http://glassattic.com/polymer/kids_beginners.htm (click on Scenes & Dioramas)
http://glassattic.com/polymer/armatures-perm.htm (click on Stands, Bases and on Wire, and more)
http://glassattic.com/polymer/covering.htm (for "Styrofoam" click on Left Inside Clay under Plastics... or click on another material you'd like to "cover" permanently with polymer clay although there are more on other pages as well)

« Last Edit: February 26, 2013 02:07:53 PM by Diane B. » THIS ROCKS   Logged

few of my photos
(had to move them from YahooPhotos, so many now without captions)
« Reply #3 on: March 09, 2013 01:24:35 AM »

The trick to using air dry clay under the polymer clay is the air dry clay has to be bone dry  and sealed before you cover it. The polymer clay will crack if the air dry clay is not completely dry.  I use the air dry as the armature base for my pen holders. I have tried several brands and the one that has work best for me is the Crayola air dry clay. it also seems to shrink less then the other brands.  I will let my air dry clay basis dry for at least 25/30 days. Then apply a thin layer of Sobo glue  and let set again for at least 2 weeks. When you cover the air dry clay with the polymer  leave a couple of small holes. The holes will allow any moisture that is still in the air dry clay to escape. 

You can see my pen bases here http://www.flickr.com/photos/mrsezy/.  They are in the 2112 set.
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