I knew an artist that made sculptures by putting a (clay?) sculpture in a bag, filling it with 100s of pounds of resin, and then somehow getting the original out of the egg-shaped block of resin. He died of cancer, it hit fast and hard.
And the glass gets under your skin.
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What is more expansive, a positive or negative mold ?
Maybe a skilled person could built direct in negative, without need a positive first.
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It would depend on the shape. What is it you hope to make?
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What is less expensive than fiber glass, and still suitable to a DYO project of a vehicle ???
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Polymetal.