This is an exclusive 15 minutes long video-story revealing all my deepest secrets about plaster mould making.
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p.s. I have used pottery clay for a master model and for the filling job before pouring the plaster. Since I needed the mould for several castings only and didn't need them to be very precise - I have used the simplest plaster found in local hardware store.
This kind of mould can be used for casting all kinds of water based slips.