I burned off a set of High Temp gaskets doing a pizza on my XL last night.
And yes I installed them "exactly" the way the factory suggested, I even let it sit for a week to fully dry. ( I know overkill )
But I learned something, I now know why this is happening.
I recently bought a small BGE for small cooks.
I noticed that even with the plate setter in the legs down position, grill on, everything still sits much lower in the tub away from the gaskets.
The XL has a plate setter that has very very short legs (.75"), sitting legs down. With a pizza stone on top it sits at the very same level as the gaskets.
Doing this is what is burning up peoples gaskets I will bet.
The heat/fire creeps through the three gaps the plate setter leaves exposed to the direct heat/fire and voila.
The gaskets and glue were just hanging there when I opened the lid. ( 600 temp )
I give up, no more gaskets for me. ( My food was starting to taste like 3M )
Gaskets are now for girly boys.
My gasket "less" XL performed just as well today not wearing a gasket.
Good lid seal I guess.
I'm guessing that XL's have the biggest loss of gaskets then other sizes where by raising the indirect cooking surface to a level that is parallel to the gaskets is the case.
Cook indirect higher up in the dome or lower in the tub.
Never ever at gasket level.
BGE should do the test, then just warn people in their operation manual.
PS. If the dome temp is at 600.
Can you just imagine the temp just under the place setter then the heat/flame creeps up to gasket level.
It really must be off the chart.
No wonder glue melts and gaskets burn.