Old plaster - WarmGlass.com

Old plaster

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Jan de Jong
Posts: 74
Joined: Sun Mar 09, 2003 3:31 pm
Location: The Netherlands

Old plaster

Postby Jan de Jong » Fri Aug 11, 2017 9:44 am

Hello, Can I use OLD plaster which I did store in a plastic jar with lid, for casting ..... plaster, silica flour and chamotte. Jan

jim simmons
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Joined: Sun Mar 09, 2003 10:37 pm
Location: Hillsboro Oregon
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Re: Old plaster

Postby jim simmons » Fri Aug 11, 2017 1:32 pm

If it is still in a powder form, there is absolutely no reason not to use it.
It is an inorganic compound so there is no expiration date.
The other Jim

Jan de Jong
Posts: 74
Joined: Sun Mar 09, 2003 3:31 pm
Location: The Netherlands

Re: Old plaster

Postby Jan de Jong » Fri Aug 11, 2017 1:35 pm

Thank you Jim. But I did read on Internet that Plaster can be used for about 4 month, so therefore my question. Jan

jim simmons
Posts: 409
Joined: Sun Mar 09, 2003 10:37 pm
Location: Hillsboro Oregon
Contact:

Re: Old plaster

Postby jim simmons » Fri Aug 11, 2017 1:41 pm

If it is on the internet, it must be so :>)
The other Jim

Buttercup
Posts: 504
Joined: Mon Jan 28, 2008 5:22 pm
Location: S.E. Queensland Australia

Re: Old plaster

Postby Buttercup » Tue Aug 15, 2017 9:08 pm

I've read that, too, a few times. Is it a myth put about by the manufacturers? Or is there more to it?

Here's some chat about it:
http://www.potters.org/subject82013.htm

I've got some that must be ten years old. I was thinking of putting it in the kiln before I tried to use it. Would I be wasting my time ? It's cheap enough to replace, I just don't like waste.

Jen

Peter Angel
Posts: 186
Joined: Fri Oct 31, 2008 9:26 am
Location: Newtown, Sydney, Australia.

Re: Old plaster

Postby Peter Angel » Mon Sep 11, 2017 7:04 pm

Look at the very top of the bag of plaster and see if there are small hard balls of plaster.

These balls are plaster that has already hardened.

Sift them out. The rest of the plaster is fine.

Pete
Peter Angel
http://peterangelart.blogspot.com/

A bigger kiln, A bigger kiln, my kingdom for a bigger kiln.


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