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Plaster Master guide to home business Work at Home pg 10
Starting your own statuary business
Making Production Molds
Open wide, say Ahh!
Open the shell and lift off
the old mold shell half which only served as a form on 
which to make the new
shell.
Lay the old mold shell half aside. You
will need it to make the mold shells for the rest of your rubber molds in the same way you
did this one.
Trim the edges of the shell with your mold
knife.The arrow indicates the plastiline
that I used to fill the spaces when the model was in the other half of the
mold. Sand the surface of the plaster if there are imperfections and generally refine the
finish by filling in holes and patching any defects.
Apply
shellac to the new shell, put plastiline in any slight undercuts that you may have on the
rubber mold or backup shell. Then soap up the mold and shell. Be very sure that you have
gotten all the undercuts filled.
Not filling in the undercuts is
the most common cause for molds sticking in the backup shell.