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Actually, balsa can be "surface-hardened" by coating it with thin (the "water viscosity") CA. I did this to scratch a Gribeauval gun carriage, and it worked fine. Cut the soft balsa, smear on the CA, and sand. Don't try to do too large an area at once, though, as the heat released as the CA cures is enuf to burn a finger. Hth, Rob
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