I applied it once Ihad the back of the marble rounded out, before I made the lense. I had problems getting the equator to melt in smooth so I really put the heat to it. I noticed when I put it in the kiln that the very core was still a dull red.
ETA: I've inadvertantly mixed 104 with boro when some 104 clear got mixed in to the boro clear at CMoG. It cracked almost before it went into the kiln. I was just starting out so I didn't realize how fast the 104 melted as compared to boro.
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Roy
Hot glass does not crack.
Unless it is glowing and drippy, hot glass looks like cold glass.
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