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Clear glaze cracking before firing


olivia.ix

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Hi all!

I just finished brushing clear glaze (mayco stoneware zinc free clear) to cone 04 bisqueware. A few of the pots have this weird cracking texture to the dried glaze. The cracking texture is only in places where underglaze is, which I applied before the pots were bisque fired. What could have caused this? Was the glaze applied too thickly? I am planning to just proceed and fire them to cone 6 but could this be a problem once I glaze fire them? 

Thanks! 

 

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Looks like the underglaze has fluxed enough to impede the absorption of the glaze plus there just might be craze lines in the underglaze also. I've had a similar thing happen with Spectrum Hot Pink Underglaze. After the glaze firing the crazing disappeared but I did start bisque firing to ^06 so the underglaze wasn't as fluxed as at ^04.

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