This is one of the things Gerstley Borate does to your glazes. Stir this and you might have 2 seconds to dip something before it turns to jelly again (this was even deflocculated with Darvan and it was OK yesterday). It has a low specific gravity (a high water content) and will dries very slowly on my bisque ware. How can I make this glaze into a fast drying beautiful-to-use slurry? Replace the Gerstley Borate with something else. What? Gerstley Borate sources B2O3, I can supply it using frits or Ulexite (depending on the amount of GB that is in the recipe). I can do that in my account at insight-live.com.
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