Here is some good ceramic stuff for those in the US...I have some and it is good stuff. As shown in the pic below I have used it to coat a coil wrapped around a glass tube and it gets red hot and doesnt chip off. Good for molding your own cups too. To fully cure it just hit it with a torch until red hot. I talked to the company and it is non-toxic when cured.
AUTOCRETE,1LB JAR - Flexbar
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Nico, you rock!!!!!!!!!!!!