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Cracks In Greenware


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#1 Tami

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Posted 15 May 2010 - 10:20 AM

Suggestions anyone?
I made a bird bath with a large slab. I Used a large mixing bowl as a mold shape and undulated the rim for a flowery kind of effect. I have been drying it slowly but last night I noticed several hairline cracks in the rim. I suspect the cracks will get bigger when I bisk fire. Any suggestions on how to fix them at this stage?

Tami



#2 AndyL

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Posted 15 May 2010 - 12:30 PM

Try a 50/50 mix of sodium silicate and your clay body in the cracks. If it was me I'd just make another.

#3 AndyL

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Posted 16 May 2010 - 07:19 AM

Tami, Out of curiousity are you building these birdbaths as a single unit or sectionally you assemble after their glaze fire?? If you do them sectionally if a unit misfires you could remake that part easier then a complete birdbath.

#4 Tami

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Posted 16 May 2010 - 10:44 AM

Tami, Out of curiousity are you building these birdbaths as a single unit or sectionally you assemble after their glaze fire?? If you do them sectionally if a unit misfires you could remake that part easier then a complete birdbath.



I have made made them both ways depending on height. I am limited by the size of my kiln. The piece with the cracks is all one piece. I could start over but I am very please with the shape of this one and would rather try to see if I can fix the problem. I will try the 50/50 mix and see if that works. If not then back to the drawing board.


Thanks for the input,
Tami

#5 Katrien

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Posted 27 May 2010 - 01:08 PM

I have used clear white vinegar (not wine vinegar) on cracks and works a treat! :)




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