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How to – Make Your Own
Plastic Molds
By Del Germyn
This is
a fast, easy way to make some free molds
for concrete,
hypertufa, plaster, etc.
First decide
what you want to copy. It must be something
that can be painted with Acetone without
melting. An example would be a brick or
rock. Clean your rock and be sure it is
dry. This is important; water
and acetone will
mix, but you don't want any water in the
Acetone. (thanks to Mary
Hershey for bringing this to my
attention.)
"for your
information, water and acetone are
infinately soluble with one
another.
Granted, for
your application, you may not want
any water present, but please do us
CHEMISTS a favor and change your
information
to what is an
actual fact.
Mary
Hershey"
I wonder if I
should correct her spelling? Us
non-CHEMISTS spell infinately like
this "infinitely"
Now get some
of that blue or pink rigid foam insulation. You
should try to get the 2 inch thick stuff if you
want your mold to last. To begin just get
whatever you can. Sometimes you can pick up a
couple of scraps at construction sites for
free.
Put your insulation on the
table, and next to it put your rock with the
side you want to copy facing up. Paint the rock
with Acetone and VERY quickly place it on the
foam. When it has sunk in an inch or two pull
it out.
Wait a while for the foam to
harden up, and there is your
mold!!
Paint on some mold release
(also known as 10w engine oil). Try not to have
any puddles; they will cause holes in the
concrete.
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