Making molds from Styrofoam Can it be done using plaster?
Posted 17 January 2013 - 07:58 PM
Posted 17 January 2013 - 08:27 PM
Good pottery plaster around here costs $16 per 50# and that seems cheap.
Posted 17 January 2013 - 08:48 PM
Posted 18 January 2013 - 12:21 AM
Posted 18 January 2013 - 07:55 AM
Carving the styrofoam to a shape desired, refine with a surform tool and apply a thin coat of plaster. Smooth is with a metal flexible rib as it sets up. It is a good type of mold...a positive form, not a negative form, i.e. a hump mold , not a slump mold. As such the clay needs to be removed before it starts shrinking.
Wahine said she wondered if she "can use the styrofoam forms with pottery plaster to make some molds".. If I misunderstood, sorry. This is the way I have used styrofoam and plaster to make molds.
Posted 18 January 2013 - 11:08 AM
Posted 18 January 2013 - 12:54 PM
Also, I just use plaster of Paris from the hardware store ... Cheap and it seems to work. My molds are only for short term use.
Can someone tell me why i should use potters plaster?
Contemporary Fine Colored Porcelain
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