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Yes, they can be used multiple times. They are as sturdy as commercial molds, and like commercial molds, make sure to follow your kiln wash instructions each time you use them so that the glass doesn't stick, and don't stack your molds when you're not using them, as this can lead to breaks. Occasionally a mold will crack in firing, as also happens with commercial molds, due to either the changes in heat, or glass sticking/expanding/contracting.
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