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Topic: Translucent mold making materials?  (Read 7594 times)
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Diane B.
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« Reply #10 on: August 18, 2010 12:01:09 PM »

Thanks for the info.  I'm not sure what you mean by "seams" though...are you just talking about the very edges of the depressions in the mold, if there are any?  
And not sure how that could result in a lot of the resin seeping out of the main cavity of the mold so not sure I'm getting everything.  Are you perhaps thinking of a mold with a lot of individual deep parts, or even undercuts, as opposed to say a cabochon shape?

As for the actual surface, I was worried that the surface of the clay could leave cloudiness from a very fine texture (especially if not a good dense brand of clay or insufficient conditioning and prep), but raw clay can be mighty smooth too if the impressing tool/item is also very smooth.  And modeling clay can be used (plasticine), I hear, so I'd expect it to be about the same smoothness.

What kind of objects (and molds) have you tried?  And what brand of clay, etc.?  And what type and brand of resin?

Diane B.
« Last Edit: August 18, 2010 12:03:19 PM by Diane B. » THIS ROCKS   Logged

few of my photos
(had to move them from YahooPhotos, so many now without captions)
hello color!
« Reply #11 on: September 12, 2010 10:58:06 AM »

Clay: I'm not sure of the brand name since I got it a long time ago, but it's a sulfur-free modeling clay. I'm looking at the clays sold by The Compleat Sculptor, where I got it, and I think it might be Chavant, Medium NSP in brown. It's a really great store if you are in New York. For the clays, they have little samples out of the package, so you can play with them and figure out which one is the right texture for your task. It can be made very smooth with water and a paintbrush, but from what I recall, even those parts came out cloudy when cast. Still, polymer clay is probably more smooth.

Resin: Any one should work, though I probably always used Easy Cast.

Seams: You are correct, I wasn't talking about a cabochon. If you just have a big block of clay and you're pushing something simple into it, then there are no seams. Actually, what I wrote makes no sense: "resin" should be replaced with "mold-making compound" (e.g. liquid silicone). I had sculpted a flatback object from clay and I wanted to cast it because I needed 6 copies of it, so I needed to make a mold - so I also built a wall around to make a mold box. It looked secure, but as I found out, it wasn't, so I had to wait for it to gel and then cast some more on top. Lesson: mold boxes are usually made with a hot glue gun because there's just no better way Smiley
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