I know the feeling! When I rebuilt my Large Imperial Kamado it developed a crack in the dome after I painted it also.
I'm repairing the cracks in my BGE and you've really got to have a clean surface for the furnace cement to adhere to, the edges I've feathered flake of very easily, unlike the claypots.
Brian - Left Hand Smoke BBQ PNWBA 2010 Team of the Year
BGE's/WSM's/BWS Gater/BDS Clones/Weber Performer w EZ-Que/Cajun Bandit/Rib-O-Lator Test Pilot/La Caja China/BBQ Guru/Weber 1000 RK Drum Coffee Roaster
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