Posted 17 March 2012 - 10:33 AM
A lot of glazes won't fit well on Raku clay because most Raku bodies are actually formulated to handle high temperatures. That's one of the reasons why they hold up well for Raku- they're really underfired at low fire temps. So most low fire and many mid-range glazes will craze on Raku bodies. It's like putting a low fire glaze on a cone 10 clay. As for finding a white glaze that will work for your project, test, test, test. Every clay body is different.
Kiln Repair Tech
L&L Kilns Distributor
Owner, Neil Estrick Gallery, LLC