Natasha - there is no initial cracking when heating for it sometimes happens after I have already wound quite a few wraps on the mandrel (when making a large bicone).
As for the bubbles - there are two different scenerio. One is that the glass contains LOTS for bubbles and it's actually kind of cool (as in the transparent purple rod) . . . the one that is problematic is the one hollow tube down the center of the rod for it leaves random large bubbles and if you are wrapping a disc for a round bead, there is not way to keep your footprint and get rid of the bubble. The beautiful semi opaque marine and Transparent Marine Green are two I find with that problem. You can literally see the hollow tube in the rod if you hold the Trans Marine Green in the light.
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Hayley
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