I'm a big fan of backer board, both as a wedging surface and for quickly drying out slop. They're readily available, inexpensive, and no worries about getting bits of plaster in your clay.
Doesn’t this warp with the moisture and make it hard to wedge?
Reclaim Tray / Pottery Plaster or Plaster of Paris?
in Studio Operations and Making Work
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Doesn’t this warp with the moisture and make it hard to wedge?