cookie davis on sat 23 mar 02
Hello all,
This goes out to anyone who wants to answer this question. I have a
question regarding what 'type' of plaster to use for a clay drying table.
Bits of my current table are beginning to flake up and chip their way into
the clay. BAAAAAAAAAAAAAAAAAAAAD. I know about pottery plaster #1, but was
wondering, is there something stronger? That won't chip, smudge, flake or
dust it's way into the clay????
Recommendations?
Thanks to all who respond,
cookie
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Working Potter on sat 23 mar 02
I suspect you've gotten possibly plaster that was not fresh or that
absorbed some moisture prior to using , not hard to do.You also may have
introduced too many air bubbles into the mix in the manner you stirr the
plaster[keep your hand below the surfface] or you may not have pounded the
floor of the form just after pouring to release trapped bubbles and skimmed
the top with a straightedge.I use mouldmaking plaster when I need it as I
would have to pay shipping as moulding plaster is locally available and it
has worked fine for many years.You might also be careful not to do cutting
of any kind on the plaster surface and let the plaster dry out completely
now and then.I am sure others will have more hints.You can get hydrocal but
it is not as absorbant and is very hard and more expensive and also must be
very fresh.I suggest you check out this link to an authority on the
subject-Http://www.gp.com/gypsum/plaster/index.html
Misty
Alan D. Scott on sat 23 mar 02
Cookie:
Consider using Hydrostone (made by US Gypsum). It is a blend of plaster and
cement, which forms a very durable surface. The wedging and drying tables I
made last fall are Hydrostone, and they are wonderful. Feel free to contact
me off-list if you'd like some suggestions for working with it.
Alan
-----Original Message-----
From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
Behalf Of cookie davis
Sent: Saturday, March 23, 2002 09:30
To: CLAYART@LSV.CERAMICS.ORG
Subject: Plaster for a drying table
Hello all,
This goes out to anyone who wants to answer this question. I have a
question regarding what 'type' of plaster to use for a clay drying table.
Bits of my current table are beginning to flake up and chip their way into
the clay. BAAAAAAAAAAAAAAAAAAAAD. I know about pottery plaster #1, but was
wondering, is there something stronger? That won't chip, smudge, flake or
dust it's way into the clay????
Recommendations?
Thanks to all who respond,
cookie
_________________________________________________________________
MSN Photos is the easiest way to share and print your photos:
http://photos.msn.com/support/worldwide.aspx
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Jim Murphy on sat 23 mar 02
"... what 'type' of plaster to use for a clay drying table. I know about
pottery plaster #1, but was wondering, is there something stronger? That
won't chip, smudge, flake or dust it's way into the clay????"
Cookie,
USG's "Puritan Pottery Plaster" may work well for your drying table.
Checkout USG's product info:
Good luck,
Jim Murphy
LOGAN OPLINGER on mon 25 mar 02
For a small one-time project which needed an material stronger than "ordinary" plaster, but would set faster than cement and could be carved after setting, I mixed portland cement with plaster in a 1:1 ratio. This is not as absorbent as plain plaster, but is stronger, and cheaper than using "Hydrocal" Possibly a 1:2 ratio cement:plaster would work for a drying table. Some experimenting with different ratios may be in order.
The project I did this for was some time ago, but I recall the setting time was longer, but after a curing for a couple of days, the material was harder than plaster. I suspect a full cure would take about 2 weeks, similar to concrete.
Logan Oplinger
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