slip to bisque often equals engobe.... change in formula. some slips will work..... but in this case engobe is friend.
i see what your thinking you dip bisque in glaze all the time......
what causes most cracking is one area in contracting or expanding faster than other (ok over simplified)
with leather hard there is less wet to dry gradient and contraction/expansion forces are less
try spraying pieces down multiple time over a period of time keep covered then slip, then cover well and dry pieces painfully slow.
why do you want to slip bisqueware?
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