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There are many different ways to harden playdough. One is to leave it out, but that can take weeks for it to fully harden. If its for like a project cover it in glue (so it doesn't crack) and bake it in the oven checking on it every few minutes.

Okay, and don't forget to start out at 30 minutes and check on it every now and then :) Hope this helped you!! (;

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Wiki User

13y ago
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Ivy Kneppar

Lvl 2
3y ago

leave it out for weeks with no container or an open container : )

happy to help :D

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DIANE SALINO

Lvl 1
3y ago
Submerge in bucket of wet cement mix; let set for six weeks; submerge putty-filled cement block in claw-bottomed bathtub loaded with St. Augustine, FL coquina shell fragments; transfer to circa 1902 bank safe.; call locksmith & Jack-

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Wiki User

15y ago

you just make it soft using your hands by making it soft you must rub it and until its soft again

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Wiki User

13y ago

You need to leave it for a day or 2 and it will becone hard.. you can make it soft after by rubbing it sevral times

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Wiki User

12y ago

It doesn't harden; that's the entire point. You can refrigerate it for an hour or two to make firm moulds, but it won't harden permanently.

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Wiki User

14y ago

Well when it gets hard put it under water

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Q: How do you make Play-Doh hard?
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