I have used a balsa cowl as a plug to make a female mold. It has been
two days and the plaster of paris mold is still damp. How long does it
take for the mold to dry? Also, is there anything I can do to make the
mold harder? It seems very soft and crumbly in its present state. Is
there anything I can spray or brush in the cavity to make it harder or
stronger. Any suggestions would be appreciated.
17 years ago