I don't know if I've mentioned how much rushing ceramics increases the fail potential, but it really really does. I'm unsure if the cracking was due to the Sigg not being dry or due to applying to bisque. I do have another piece to test that has had plenty of time to dry.
My art professor Christopher Hentz used to tell us, "anything worth doing is worth doing the easy way." I have always taken this to mean the right way is the easy way because the wrong way is never easy in the long run. So I'm a day behind on the china firings because I spent Saturday grinding off the cracked spots.