US Gypsum CASTING PLASTERS (Gypsum Cement)
UPDATE AUGUST 6th 2026
WE ARE OUT OF PLASTER
US Gypsum is ceasing operations at it Oklahoma plant which produces the casting plasters Clay Planet has supplied for decades.
This includes the discontinuation by USG of #1 Pottery Plaster, 20 Minute Casting, Hydrocal White, Hydrostone, Ceramical, and FGR-95.
We are working with a different Gypsum supplier to be able to bring back similar products from another source in the near future. This should include equivalent products matching the #1 Pottery Plaster, 20 Minute casting, and Hydrocal White.
Please be patient as we try to ensure the continuation of these products. This page will update when we have new information to share.