There is no reason to fire plaster. The reason for firing clay is so it can
go through the chemical transformation that makes the minerals/slica melt
together to create a glass-like permanant piece. Plaster does not need to go
through this process. It just needs to dry. I suppose if you wanted to make
sure it was really dry, you could set it in the kiln with the door cracked on
the lowest possible setting....but you could also set it on the heater!
My feeling is that once the plaster had exploded because of all the water in
it, it would probably just get very dry and brittle and basically ruin the
As art teachers, it is very important to understand why we have the
equipment we have, how to use it, and how not to use it.