Craig Dunn Clark on thu 6 may 04
Patricia, I was given an assignment in a design II class using loose set
sand in a square format. We were to make a design in the sand and then pour
plaster into the design for the positive. First I pressed each of my hands
fingers deep into the sand and then had a buddy shove my face into the sand
between the fingers. Pulled my face and fingers loose carefully. Mixed up
some No.1 pottery plaster, poured it into the negative, let it set up a bit,
and then pulled it from the sand.
We cleaned the pieces with fresh water from the garden hose pretty quickly.
That removed the majority of the sand, though there was some sand texture in
the plaster. That is the nature of a loose set sand mix when pouring
plaster. Our mix was a bucket of sand, coupla handfuls of clay and just
enough water to make the mix damp.
If you are after a pristine surface with more controllable registration then
you might consider using a bonded sand mix. On top of that you will be able
to carve the sand however you see fit, avoiding undercuts if you don't want
to set up multi part molds.You can get the binder and catalyst from any
foundry supply company. Are you located near an industrial area. We have
Able Supply and what used to be AP Green (long since changed it's name to
something else) here in Houston.
Hope this helps
Craig Dunn Clark
619 East 11 1/2 st
Houston, Texas 77008
(713)861-2083
mudman@hal-pc.org
----- Original Message -----
From: "Patricia Gilmartin"
To:
Sent: Thursday, May 06, 2004 8:19 PM
Subject: sand casting - how?
> I am interested in making my own sand mold and casting with casting
> plaster or clay slip. Tried it once w/ the plaster and sand stuck firmly
> to the surface. Maybe a soft fabric between the sand and plaster?
>
>
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Patricia Gilmartin on thu 6 may 04
I am interested in making my own sand mold and casting with casting
plaster or clay slip. Tried it once w/ the plaster and sand stuck firmly
to the surface. Maybe a soft fabric between the sand and plaster?
pdp1@EARTHLINK.NET on fri 7 may 04
Hi Patricia,
The shape of the cavity will matter as for what you may use
for insulateing the sand from the Plaster's tendency to
stick to it...
For simple shapes...maybe a thin plastic film, such as from
a dry-cleaning bag...might work.
If the cavity were more complex, maybe one could slooosh
some sort of thinned, liquid rubber of some kind, to seal
it...even Paint may work well enough, as especially of an
oil base kind, which after it has dried, could be coated
lightly in some light oil or W-D-40 or something, as would
discourage adhering of the Plaster...
Just a cursory thought...
Phil
el ve
----- Original Message -----
From: "Patricia Gilmartin"
> I am interested in making my own sand mold and casting
with casting
> plaster or clay slip. Tried it once w/ the plaster and
sand stuck firmly
> to the surface. Maybe a soft fabric between the sand and
plaster?
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