Mold Making - 2 Piece Plaster Mold
In this video, I demonstrate how to make a 2 piece waste mold of a sculpted terra-cotta clay form. The 2 piece waste mold is used to make only 1 casting and is discarded after use, which is why the word "waste" is used. Therefore, "undercuts", which are areas where the mold will lock onto the sculpture, are not an issue and with this technique, you can make an mold out of almost most any sculpted clay form.
Materials:
Water based Clay
No. 1 Casting or Pottery Plaster
Scraper Wax Resist or Vaseline
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Is there a video before this one please showing how to construct the fence and what it’s made of? Also, was the clay coated in anything to aid release once the mould is hard? I remember doing this about 50 years ago and I seem to recall using very thin squares of copper to construct the fence. Is this no longer done. I want to start sculpting again and your site has been very helpful in reminding me of most of the various processes. Many thanks.
@nathanorosco-demonstration5637
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Hi! I usually use a clay to construct fences. I roll a coil of clay t about 1inch round then compress it to a 2 x 1/2 in shape strip. I will eventually make a video of this step. I do not use metal shims (copper or aluminum as you mentioned) for silicon rubber molds. I do use metal shims to create plaster molds though, which is the more classical mold making process that is still very valuable for specific sculptures. No, for this sculpture I used water based terra cotta clay and kept it leather hard (still wet but stiff like wax), so silicon doesn't stick to anything "wet". Glad my videos are helpful! Many thanks!