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Please make sure you’re use castable plasted as a Plaster of Paris or silimar.
We recommend to use G-1 Release for all concrete and gypsum casting.
Add Pigment to your pre-measured water then add plaster.
We recommend approximately 9 US fluid once (.27kg) per 1 lb (.45kg) of dry gypsum.
If you’re use mechanical mixer add Citric acid to slow down the gypsum curing time.
Gypsum absorbs moisture, make sure you’re use a sealer if you’re apply gypsum stone for a kitchen back splash.
P.S. If you will color the gypsum stones with stains, do not use release agent. In general gypsum do not stick to the molds, but release agent helps to remove air pockets from the stone face. Release agent create a barrier between stone and stain. Stain will not get absorbed to the gypsum if release agent applied to mold. Release agent can be washed out with water prior coloring with stain if stone casted from concrete, but gypsum stone cannot be washed out with water.