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I am having trouble with successfully firing large flat pieces in a glaze kiln. When I bisque fire them, I put a little sand under them to reduce the friction on the shelf as they shrink and move during firing. This has been very successful. However, I am hesitant to put sand in a glaze kiln especially with a vent master drawing air downward. I am afraid that the sand will be drawn into molten glaze. My question is: is that a reasonable concern? If so, what would any of you suggest to use to keep large pieces from breaking apart at ^6. Might the problem be solved if I brought the kiln temp up much more slowly? What temp range is the most critical? Is it possible that all the moving sand will have "found a home" by the time the glaze is molten? This still feels if-y to me... I could use some sage advice!