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casting paper
Ewic
Tuck Langland, in his book, From Clay to Bronze, has a chapter on casting in materials other than metal. He spends about a page or so (pp. 112,113) going into detail about casting in paper using paper pulp in a plaster mold. Plaster, of course, will wick out a great deal of moisture. I think this would be preferable over a silly-cone mold with a plaster mother mold, because the water from your wet medium can't go anywhere if it is in a rubber mold. I would only use silicone molds for materials that solidify or cure on their own, e.g. plastic or plaster or wax, & c. Tuck mentions that it is easier to do paper casting as a relief. Perhaps you could mold your mask in sections and glue the pieces together.
Tuck's general procedure is to lay the pulp (in your case, papier mache, which may have less water) into the mold and alternately stipple the material into the nooks and crannies with a short, stiff brush (such as a stencil brush), and remove the excess moisture by patting the material with a sponge. When it looks fairly dry, you fill the whole thing with a pile of glass marbles so the paper doesn't curl up as it dries.
As far as making your mold, it would have to be a multipart mold anyways, with keys in between the sections so that the parts line up. Dinnae forget to seal your prototype model properly and apply a mold release, so you can pry the mold sections off of it.
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