Concrete
I have yet to see concrete powder coated, but hey why not. However, my concern is with the temps you are looking at. Water boils at 212F and with things mixed in, that may be raised slightly. But the heat applied to the concrete to acheive boiling point will be much higher. If the outside is coated and heat is applied the powder will not hold up to flame temps and most elements will burn powder if you use electric. I suggest you go with a liquid coating, but you need to contact manufacturers directly for the exact specs. There are high temp powders on the market but I haven't seen one sold as food grade yet and most can't go above 900 to 1000F.
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