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I Forge Iron

Shape, trim, sand, grind Kastolite 30?

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Has anyone tried to shape, trim, sand or grind Kastolite 30 after curing?   Making a ribbon burner and the mold left some ridges/high spots I’d like to clear away, without stressing it too much.  Thinking that I might be able to use a file, flap wheel, grinding disc, abrasive cutting disc, or similar to shave some down.   Piece has been curing for 48 hours.

Wondering if it’s sandable without severe risk of cracking.

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