7
Once it has been covered with talcum
powder, the stone with the glue mould should be
covered with aluminium foil. This phase should
be done with care. To stop the polyurethane
foam from sticking into the mould, make sure
there are no holes in the foil. You can even use
two layers of foil laid in opposite directions.
The stone and the glue mould are
carefully covered with aluminium
foil.
After that, spray the foam on top of the foilcovered mould. Let the foam dry overnight and
then you can open the package!
Spray the foam on the foil-covered mould.
After drying overnight, you can remove the
stone from the cradle.
When taking off the mould from the stone, use talcum powder. The surface
of the mould against the stone can still be sticky and may stick to itself,
which can ruin the process.
Peel the mould from the stone. Again, use
talcum powder liberally.
Dust the stone as you take it from under
the glue mould.
Before getting to the actual casting, I?ve
let the glue mould dry in the cradle for a
couple of days. I?m not sure if this is
necessary, but I did this just to be on the
safe side!