Jeffrey Francis Longtin on mon 25 nov 02
Dawnie,
A presumption: by hump mold you're describing a mold, an object really, onto
which the clay is draped AROUND? An object, presumably porous (plaster or
bisque) which does not shrink as the clay shrinks. (cause of cracking)
Alternative solution: Is it possible for you, or your students, to make a
reverse mold of the piece they want to mold off of, i.e. turning your "hump"
mold into a slump mold?
If it is just the shape they're going after this could help solve their
problems. A slump mold, i.e. a mold that is essentially a bowl-like form,
would enable your students to leave the clay in the mold without fear that it
would cause any sort of cracking.
If that is not possible, the mold has an important texture for instance, than
the most efficient solution is too decrease the depth of the form. Or,
possibly, to put plastic between the form and the clay. The plastic will slow
the drying of the coils at the same time it will allow the coils to take the
form fairly easily.
Questions? feel free to drop a line.
Jeff Longtin
Complex Molds Made Easy
,,,and other such things
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