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Step 6Adding the plaster
Mix up some Plaster of Paris. You'll only need enough to cover about an inch of the jar inside the soup can and if it's a little watery, it's easier to work with.
Pour the plaster of paris into the upside-down soup can then push the jar into the can and apply pressure so that the plaster makes good solid contact.
Wait until the plaster starts to set (2-4 mins) and unscrew the lid about a half to a full turn, then push down some more. This way when you screw down the metal lid in the future, it goes very snuggly in.
Let it sit for 20-30 minutes to solidify.
Pour the plaster of paris into the upside-down soup can then push the jar into the can and apply pressure so that the plaster makes good solid contact.
Wait until the plaster starts to set (2-4 mins) and unscrew the lid about a half to a full turn, then push down some more. This way when you screw down the metal lid in the future, it goes very snuggly in.
Let it sit for 20-30 minutes to solidify.
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