BDDS
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We found multiple cracks clear through a pressed emax crown after glazing, our first issue with the product... removed from heat too soon at some point?
I do it all the time, trying to make sure its not in a centric functional area.
At the lab I work at, I was glazing a posterior e-max crown and I noticed a fracture across the occlusal surface. To make matters worse it was a rush case that was due in couple hours. I adjusted the glaze parameters so the final temp was 880 Celsius, temp climb 45/min, and 1:00 hold, after it came down, the crown didn't have the fracture anymore.
This crown was finished by someone else, and possibly a carbide bur was used.
The temp 880 Celsius was chosen because the pressing oven presses the ingot around 910 Celsius(not positive on exact final pressing temp),but you follow the logic in choosing temp.
Hope this helps in rush cases, I'm not sure of the consequences of doing this. I would suggest, if you have time to always re-wax.