I never had any bubbling issues with either of my Imperial Kamado fireboxes, and the BGE firebox seems very solid, I broke up a lot ot the large bubbles and I'm thinking I may use the Rutand gasket cement to coat the firebox.
The Hercules Furnace cement did ruin a Harbor Freight step drill bit that I used to clean out the vent holes on the firebox, so it is pretty strong stuff.
Brian - Left Hand Smoke BBQ PNWBA 2010 Team of the Year
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