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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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