I have worked with the stuff.
You mix two precursors, and some pigment if you don't like coral pink.
The mixture becomes sticky.
Heat it and it gets less sticky, and then runs,
and at ~160F it oozes a crapload of water while absorbing heat,
then continue heating it
and it gets more viscous,
and eventually gets rigid.
I would not expect any sort of model to be 'simple'.
Mike Halloran
Pembroke Pines, FL, USA