I dutifully scrape and reprime my kiln shelf each time I fire glass higher than 1300 degrees F (704 degrees C). Is that really necessary?
It depends on the temperature of your firings. If you fire to a full fuse, reapply fresh kiln wash (also called shelf primer) after every firing. If you tack fuse, reapply kiln wash only when the old coating has flaked off.
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