Can Raku pieces hold water?

Yes and No. Yes Raku pieces can hold water, but since the clay is not vitrified (fired high enough to seal) the water will seep through the clay. Now using a glossy glaze on the inside will tend to slow the seeping, but generally Raku glazes craze and the water will still seep. To ensure a Raku piece will not leak water, the inside of pieces can be coated with a standard water sealer. This should ensure a watertight Raku piece.

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Gary R. Ferguson - Raku Artist