Thanks to chilly for the response, I will give it try that is something simple though I am used to being in over my head, lol.
Hello Jeff,
I have seen videos about that issue, the hardness of the plasticine maybe effected by the heat generated during the curing process of the plaster. I am using a med hardness for this piece which seems firm but that does give me pause in that I had planned to do a simple piece first just to get started and (duh) why not do two in one and test the hardness /potential warpedness of the various plasticines at the same time test my plaster mixing skills.
I'm always getting ahead of myself, lol