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Does not set like cement. Washes with water and some elbow grease. One pound of lime will suck up around a half gallon of water,swells up quite a bit, will generate some heat also. Interesting chemistry here.

I came upon this thread late, I would suggest the use of a few bags of burnt lime to stiffen the mud. Stuff works like magic. Old farmer showed this to me years ago, it really works well.