How to Grind off Glazes that Misbehave in the Kiln

Have you ever spent a lot of time on a piece, then opened the glaze firing to find out that the glaze ran right down to the kiln shelf? It may be worth trying to grind the glaze off to save the piece (or at least have it has a functional second).

First, cut off most of the glaze with a cutting disc and rotary tool. Go slow and let the tool do the work. Don't apply too much pressure and try not to bend the cutting disc. Always wear eye protection when using a rotary tool.

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Next, start grinding the glaze down with a coarse grinding wheel or grinding attachment on a rotary tool. Slowly grind down the glaze until the foot looks uniform in shape again. After the rough grind, switch to a fine grit sand paper to polish off any sharp edges.

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Here's a quick video of grinding off a glaze run from the foot of the pot.

Another problem you may run into is a wobbly or rocking pot. Sometimes this happens because a wonky kiln shelf or kiln wash kept the pot from shrinking properly during glaze firing.

The only way to get a wobbly pot to sit flat is by using a large diamond sanding disc. Many people don't have this, but here is a little video demo on how to do it anyway.

Now these pots rock because they look awesome! Not because they are actually rocking and wobbling.

Now these pots rock because they look awesome! Not because they are actually rocking and wobbling.

Deborah Schwartzkopf

As a studio artist, she makes fabulous tableware that infuses life with purposeful beauty. Deb was inspired by the guidance of amazing mentors along the way. These important relationships fostered her desire to engage and build community through clay. Her adventurous spirit has taken her across the country and beyond to form a depth of experience, knowledge, and a supportive network.

In 2013 Deb established Rat City Studios in her hometown of Seattle, WA. RCS is her home and personal studio, as well as, a creative space for multiple studio members working independently. In 2022 she opened a sister studio, Rain City Clay in West Seattle. RCC is a community art center focusing on experiential learning through ceramics classes of all levels.

With over 15 years of experience, a Master’s of Fine Art at Penn State, artwork included in collections such as the Kamm Teapot Foundation, San Angelo Museum, and the WA State Arts Collection, numerous publications including Ceramic Monthly, Pottery Making Illustrated, and Studio Potter Magazine, she has been recognized and honored in her career as a maker.

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