Page 115 - Casting of Angels- Dave Parvin
P. 115
111
Finishing the Mold are two hands to spread the
seam apart as a third hand
In order to remove the wields something very sharp,
mother mold and expose the preferably a scalpel as in
now setup rubber, I first photograph #29. Make a
unscrewed all the bolts. Since I zigzag cut so that the rubber
had used a silicone rubber, it keys back together until very
was very unlikely that the close to the model. For the last
mother mold and the rubber 1/4” or 2/3 cm., make the
would be stuck together except parting cut as straight as
by suction. Gently inserting a possible so that parting line on
sharp wedge or pry bar into the will be minimized. Remember
seam would probably have to follow the black line that
been sufficient. However, was drawn on the model
Photograph #27 photograph #27 shows a (photo #1) so that the parting
simple but very effective trick. line will be where you had
I had drilled a small hole, determined that it would be the
about 1/8” or 1/3 cm., through least conspicuous. Proceed
the Forton MG in the middle slowly and carefully so as not
of each side of the mother to cut your assistant, yourself,
mold. One who has never done or through the sides of the
this might worry about drilling Mohawk. Don’t make the
through the rubber. The fact is parting line any longer than
that it is much easier to drill necessary, cut only far enough
through Forton MG than to extract the model.
rubber. As long as only slight Photograph #30 shows the
pressure is applied to the drill, rubber spread apart like a
you will fell the bit break butterfly shrimp after the
through and then stop, barely model had been removed.
nicking the rubber. Then
Photograph #28 blowing air into the hole and Using the Mold
between the rubber and Forton
MG will separate the two To reproduce the model
easily. with this mold was just a
In photograph #28, I was matter of deciding what
cutting off most of the rubber material to use, mixing it,
that filled the pour spout. This filling the mold, letting it cure
really wasn’t necessary since as necessary, and extracting
this particular rubber structure the reproduction. Almost
wasn’t actually in the way or anything that will go from
Photograph #29 liquid to solid such as plaster,
doing any harm. But to leave it
dangling there just didn’t seem hydrocal, hydrostone, concrete,
like a proper thing to do in polyurethane and polyester
Colorado; maybe in California resins, epoxy, wax, Jell-O,
... Where was Sigmund Freud chocolate, Forton MG, etc.
when I needed him? would have worked fine. The
The only thing remaining only thing that I can think of
was to remove the plaster that I could not have used was
model, the need for the optically clear polyurethane
Photograph #30 reproduction of which started resin which requires a
this epic journey. All it takes platinum cured silicone rather
2
