>I have several custom plaster molds that have been used in ceramics and
>are showing signs of wear.
>My idea is to use a Sculpy or equivalent and create pressed castings of
>the molds, resculpt them to correct defects that are starting to appear
>and then make new molds.
>Anyone with any experience who can help me will be appreicated. Some of
>my questions: Do I need to coat the plaster mold surface with any >release
>How do I reclaim the sculpy from the mold with minimum or no distortion.
To minimize distortion of the Sculpey, I would cure the polyclay
in the mold, then unmold it. Doing that would definitely require
some sort of mold release, preferably a dry one, or one that would
not evaporate under the oven temperatures required to cure Sculpey.
The only poly clay molding I've done has been with small pieces which
I was working back into after molding, so distortion didn't matter,
so I would strongly suggest practicing and experimenting on a
small mold you didn't care about (if need be, just make a mold of
some likely household item in a dixie cup or butter tub) to get
the technique perfected before moving on to the ones you're trying
I've yet to find a mold release that really makes me happy when working
with plaster, but perhaps someone here will have something to offer.
On the other hand, the examined life isn't very lucrative.