Pottery Kiln Wash? - WarmGlass.com

Pottery Kiln Wash?

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lbailey
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Pottery Kiln Wash?

Postby lbailey » Fri Aug 03, 2018 4:39 pm

Was asked if kiln wash for pottery would work to coat/protect the bottom of a new glass kiln. (They plan to use kiln wash for glass on shelves, molds, etc)

Have no idea so asking the experts here.......

Thanks

Brad Walker
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Re: Pottery Kiln Wash?

Postby Brad Walker » Sat Aug 04, 2018 8:23 am

Will work, sometimes sticks to glass during fusing more than a kiln wash formulated for glass.

Should work fine for coating molds.

Judd
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Re: Pottery Kiln Wash?

Postby Judd » Mon Aug 13, 2018 2:42 pm

When we made pottery kiln wash in college, it was 50% EPK and 50% Alumna Hydrate. To make it more like glass kiln wash, you would have to add 20% to 30% Alumna Hydrate... right?

Brad Walker
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Re: Pottery Kiln Wash?

Postby Brad Walker » Mon Aug 13, 2018 3:04 pm

Judd wrote:When we made pottery kiln wash in college, it was 50% EPK and 50% Alumna Hydrate. To make it more like glass kiln wash, you would have to add 20% to 30% Alumna Hydrate... right?


I always did the opposite. More alumina hydrate, less EPK kaolin. That's a soft wash, doesn't usually stick, single use.

Some recipes call for EPK and silica, instead of alumina hydrate.

Bullseye's formula is mostly aluminum trihydroxide (also used in antacids), kaolin, silica, and another ingredient they won't tell us.

Terry Gallentine
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Re: Pottery Kiln Wash?

Postby Terry Gallentine » Sat Aug 18, 2018 11:22 am

I use 60% alumina hydrate and 40% calcined kaolin. I think that the calcined kaolin is a little looser than the EPK.


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