When glaze is frozen the single biggest concern is the container splitting open. The glaze product itself is not damaged or chemically altered in any way. The freezing can and will tend to make glazes separate and form a watery layer on the top of the jar once thawed. After thawing, shake the container vigorously to recombine the water and solids. In extreme cases, the glaze may need to be stirred vigorously to recombine the materials.
View a post made by Amaco about the freezing and thawing of their glazes and underglazes LINK
View a statement made by Mayco about the freezing and thawing of their glazes and underglazes LINK
The Sounding Stone
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