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Casting clays are much more absorbent, when bisque-fired, than thrown ones, thus the same glaze that goes on the right thickness on a thrown piece can go on twice as thick on a cast one. Here are some measures to take to get it on thinner:
-Bisque higher to reduce porosity.
-Add more water and a gelling agent to create a thixotropic slurry (proceed with caution, at some point it won’t gel).
-Dip more quickly, much more quickly. One way is the use of dipping tongs, this enables dipping and extracting very quickly.
-Prewetting the ware might help on thinner-walled pieces (on thick-walled ones the glaze will still go on too thick).
-Add CMC gum to the glaze, but be careful, that can bring other issues (e.g. drip, drip, drip, drip). Perhaps just enough to create a first coat dipping glaze.
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