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Step 6Set & Demold the Plaster Casting
As soon as the plaster has set and is dry (you may still feel some moisture in it) remove the plaster part from the mold--don't worry about tearing the alginate mold--you won't need it again.
For a relatively small part, it may take as little as 45 minutes to an hour for the plaster to set enough to remove it. Keep an eye on it and remove the part as soon as it's dry--don't wait until the next day, since the alginate will continue to dry out.
Discard the alginate mold and put the plaster casting aside.
For a relatively small part, it may take as little as 45 minutes to an hour for the plaster to set enough to remove it. Keep an eye on it and remove the part as soon as it's dry--don't wait until the next day, since the alginate will continue to dry out.
Discard the alginate mold and put the plaster casting aside.
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