"xray" wrote in message
...
On Wed, 09 Nov 2005 00:27:25 -0800, Don Bruder wrote:

The "damned if you do, damned if you don't" of plaster (and its "kissin'
cousins", cement, mortar, and concrete) can be truly frustrating
sometimes.

I hear what you are saying but what, then, is the appropriate material
for making a mold for something like lost-wax casting of metal thingies?

I could probably research it, but it is easier to just ask here.

Investment ceramic. An important part of how an investment mold works is
that the material is *porous* -- and the layer is thin enough to let steam
escape.

--
Ed Huntress