You should look for investment plaster. This should be available from
jewellers supply places and possible dental supply also. It still needs
to be baked to drive off the chemical water but is formulated to
withstand the high temperatures of the molten metals.

xray wrote:

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.