I have seen some with insane amounts of crazing and still can’t put my finger on what exactly causes it out side of high heat. As we all know .. some colors seem to be the whipping post of the crazing monster. The worst cases I have seen always are the blue kettles? I have seen others but mostly on blue and almost all the blues have pops at the straps. My theory with the grate strap enamel pops are due to the spot weld and the thicker metal in this spot. This extra thick chunk of metal directly touching the charcoal grate conducts more heat and that causes a hot spot.
OR it’s a colder spot and the kettle metal around this weld is hotter ?
Anyways.. crazing in places other than the straps is in my idea caused buy insane temps in combination with cooling from wind.
We have all seen the video from the Weber factory when the enamel is baked on and the kettle is glowing red.. this is baked with an even heat in an oven and that is not a problem.
Proof that the enamel can take the high temps.. but high temps in one place = Crazing
Just my 0.02
Edit:
All that being said.. I still can’t explain the crazing below the charcoal grate all the way down to the air vent holes?
Unless someone once used a whole bottle of starter juice in a epic fail of an attempt to start 8kg of coals for 4 hotdogs.
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