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Why not hardboard? Answered

why don't we use hardboard wail useing plaster? Can the plaster make the hardboard soggy or something? And what do we use for plaste?

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Yes, hardboard mold walls can't stand up to the wetness. For plaster molds, plexiglass/acrylic or boards with a laminate surface work best.

Can you please reword your last question? I'm not quite sure what you mean.

Best,
Paige