Making Garden Stone Molds
BRUSH ON METHOD USING LATEX
AND A MOTHER MOLD
Latex is the least expensive
of all the flexible molding compounds. Since it is so strong and
so flexible it can be used to create a multitude of different molds.
Undercuts are no problem for this material. In all cases using latex
a mother mold is necessary.
In this example I am using a
plaque that was damaged in a fire. Instead of refinishing it I am
going to reproduce in plaster from scratch by making a mold from the original.
Also, I am going to increase the thickness of the plaque by using clay
around the base.
Modeling clay is applied to the underside
of the model to raise it up off the baseboard and to seal off the mold
so that the latex does not seep under.
The model is flipped over and pressed onto
a coreplast baseboard.
The edges are smoothed out so that the finished
mold will create a plaque similiar to the original only thicker.
Once the model is attached to the baseboard
the entire model is sealed with Krylon Acrylic.
After the acrylic dries the model is sprayed
with a release agent to keep the latex from sticking.
The model is coated with several coats of
latex molding compound. Between coats the brush can be stored in
a cup of water. About 10 coats will be applied in this example.
After coating the model with latex it needs
to vulcanize or set up. This takes about 4 days at room temperature
or 4 hours at 120 degrees. After the latex has set a containment
can be built around it like in the previous example and after spraying
the containment frame and latex covered model with a release agent a plaster
mother mold can be poured. Once this has set you are ready to separate
the mother mold from the latex mold and containment field and the latex
mold from the model. To create castings simply lay the new mold into
the plaster mother mold, spray with a release and pour your plaster or
cement. Let is set and pop it out of the mold. Latex
is very durable and will yield a large number of castings.
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