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FAQ/Answer

Can an imperfection in the kiln shelf cause bubbles in glass fusing?

Yes. A warped shelf can cause bubbles, because the air in the low area of the shelf will expand during firing. If the air is trapped, it will try to escape from under the glass by forming a bubble. Lay a straight edge across the surface of the shelf, and look for low spots. If you find one, try firing the shelf upside down. If you still get bubbles in the glass, then the shelf is not likely the cause of the bubbles.

Also, pre-fire the shelf after applying kiln wash or glass separator. Moisture in the coating can cause bubbles.



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