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Topic: How can I use floral Styrofoam as a mold for plaster of paris?  (Read 515 times)
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MinnieMay9
« on: August 17, 2013 12:44:53 PM »

So I have been looking into some things for random cosplay.  I found these really cool hollow half-sphere things in the floral section of my local Jo Ann Fabrics.  Well, the outside is much too big for what I'm looking to have, but the inside looks to be almost perfect.  I was thinking of filling it with plaster of paris and making a hold that I could shape things over.  Here is what I'm wondering.  How can I get the plaster out once it sets?  It would be ideal if I could keep the foam form in case I need to make a new one (they are kinda expensive).
They are a lot like these: http://www.craftmill.co.uk/polystyrene-styrofoam-plastic-balls/large-hollow-polystyrene-balls/polystyrene-balls-styrofoam-balls-in-2-hollow-halves
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« Reply #1 on: August 22, 2013 07:01:30 PM »

What if you put saran wrap or some other kind of plastic coating? I've never tried it but it might work??
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MinnieMay9
« Reply #2 on: August 22, 2013 09:16:39 PM »

I was thinking of that...but I was a bit worried that it might leave weird ridges?  Though I guess I could just mix a bit more to add to smooth out the surface.
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