glaze flaking off in high magnesium glazes

[Lawrence Weathers]

Lalone crawl is one of the worst . it is very high in magnesium. But I don't want to reduce the magnesium because I like the fired affect very much. On application to bisque it all begins flaking off as soon as the shininess goes away and the glaze becomes dull. It eventually flakes off in large chips. thus I've only been able to use it on horizontal surfaces. Does anyone have any suggestions on how I can get the glaze to stick on vertical surfaces?

Nepheline Syenite          70

Ball Clay                           5

Magnesium Carbonate    25

thanks

Larry

[Tom Anderson]

hi Lawrence:

Crystalline glaze is notorious for being more flaky than granny's' biscuits. Two different methods: a 50/50 blend of EPK and Bentonite: up to 5% recipe weight addition.

More radical: white elmers glue is blended as part of the liquid in small amounts. The glue is organic (latex primarily) and burns off in a glaze fire.

Tom Anderson

[Lawrence Weathers]

hi Tom

Thanks for the suggestions I think I will try both approaches. You have any idea what percent Elmers I should add?

thanks Larry

[Tom Anderson]

Larry:

The only time I have used it is when mixing magnesium and cobalt colorants. I mixed 25% elmers, with 75% water. You have to dry sieve first, then add. Elmers and sieves do not mix very well.

Tom

[Lawrence Weathers]

tom

That gives me a good starting point thanks

Larry

[Lawrence Weathers]

What end up working best is mixing a little Elmers with the Glaze.  If you put too much Elmers it won't crawl as well. Putting a layer of Elmers on the pot and the glaze over it doesn't do anythingAnd.

[Tom Anderson]

One problem down.. onward. MGO has some unique chemical properties.

Tom