File puptcrit/puptcrit.0803, message 505


Date: Sat, 29 Mar 2008 16:57:36 -0400
To: puptcrit-AT-puptcrit.org
Subject: Re: [Puptcrit] Industrial type PVA?


 >>> The PVA (Poly Vinyl Alcohol) that we use in our shop is a green  
liquid and is used as a mold release or barrier coat in mold making.  
It is used a lot when working with fiberglass. For example, when  
releasing a fiberglass casting  from a fiberglass mold, or as a  
parting agent for the second half of a fiberglass mold or mother mold.

 >>> It also comes in quite handy if you use a platinum base silicone  
against a material that would normally inhibit the cure of the  
silicone (platinum base silicone is quite touchy in that respect).  
The PVA acts as a true barrier coat, yet is 'very' thin and will not  
affect the detail of the piece being cast. You can brush PVA on or  
apply with an airbrush. The nice part is, when  you are finished, the  
dry PVA wipes away and dissolves with just water.
---------------------------
Mike,
Would PVA parting film like Partall work with oil clay, plasticine? I  
use epoxy and fabric over clay a lot, and It would be great if I  
could coat with something that would let me get the epoxy off without  
the clay sticking.
thanks,
Ed
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