Q: What is Bondo, and is it a good material for sculpture?
A: Bondo is a proprietary two-part polyester-based compound, used mostly for autobody
repair, and as such has the toxicity problems associated with this material. I would hesitate
to recommend its use as a general sculpture material, but it has its uses, mostly as a
sandable top-coat for items that must be absolutely smooth.
Recently the company has come out with a new material, also called Bondo, which has a
different chemistry, and is (presumably) less toxic. This, however, does not set in thick
sections like the older material, but must be applied in layers no more than 1/8 inch thick.
It is a one-part compound that cures on exposure to sunlight or another UV source, and is
more easily sandable than the original.
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