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Robert Oblon
Joined:
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04-Aug-2004
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Started On : 10-Aug-2005 at 03:30:03 PM, #Views : 6341
Topic Subject : Re: casting in silicon |
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Jesse
We've made very large silicone molds in two halves (book molds). First we
decide where to build our parting line(s) then we build a clay shim at the
parting line, build a box type form to hold the silicone, mix and brush. Cure
over night, back silicone section with Hydrocal and hemp mix (also note that
with large volumous molds, we create large positive nipples while "pulling" the
silicone as it sets, allowing those nipples to protrude through the Hydrocal
mother mold, locking it to the mother mold). Once Hydrocal sets, we flip mold
over, strip clay shim, clean surfaces and rebox mold and pour (brush) second
half of silicone, etc. You will need a release agent to coat your Fiberglas
otherwise the silicone rubber will bond to the Fiberglas sculpture.
There are other ways to create your silicone rubber mold(s) but the method
above is the most cost effective when using silicone rubber.
I hope this helps.
If you have more questions, please fell free to email me direct at
_hotbronze@aol.com_ (mailto:hotbronze@aol.com)
Regards
Robert Oblon
Central Coast Art Foundry
Arroyo Grande, California
805-748-5381
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