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When making tile tools and pitch lap foundations of
dental stone, I have been using saran wrap to cover the bottom of the mold and
permit easy separation. This is OK for shallow curves like
telescope mirrors, but when the curve gets deep, the saran wrap wrinkles and
those wrinkles get molded into the surface of the casting.
Yesterday I tried a garbage bag, and it works MUCH
better. However, there are still some wrinkles.
So, what I am looking for is the right stuff--
something that will stretch under tension to conform to a convex mold surface,
or stretch under the weight of the dental stone or castable refractory to
conform to a concave surface. Whatever it is will be
cheap, commonly available, and come in sheets big enough to cover a mirror
surface. (That last requirement eliminates the obvious cut up rubber
condom which somebody is sure to suggest.)
Any good experience or ideas out
there?
. . . Richard
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