With these Mayco molds, you get two molds for the price of one because when each two-part plaster mold is separated, a slump and hump version of that shape is revealed.
With a slump mold, the clay "slumps" or sags down into the mold, creating a concave shape. When you want to add embellishments to the inside of the shape or around the lip, use a slump mold.
With a hump mold, the clay is draped over the mold, creating a convex shape. Use a hump mold when adding feet, handles or other embellishments to the outside of the shape. Note: plaster molds are not to be used for glass slumping.
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