Many potters will use Lana Wilson's Magic Water to help two pieces of clay stick together better. Here's the recipe:
1 gallon water
3 tablespoons liquid sodium silicate
1 1/2 teaspoons soda ash
It works really well and many potters swear by it. But what do you do if the crack has formed after the attachment is made or on someplace that isn't an attachment, like the bottom of a platter. Sometimes if you've put a lot of work into a piece you don't want to throw it back in the recycle bucket just because it dried unevenly and developed a little crack.
|It's Horse Hair, It's Not Really Cracked|
You can go buy mending fluids that do work pretty well, or you can make something right now. I take a little bit of slip from the clay I've used to make the piece, add a drop of vinegar (it's a deflocculant) and a little bit of very shredded paper. While at Mudfire I can find plenty of paper dust hiding in the corners of the paper towel dispensers, at home I shred a square of toilet paper. I mix these together really well then brush into the crack. The mend may need to be lightly sanded (outside wearing a mask) and reworked a time or two.
This mixture has worked on greenware and bisqued pieces. A word of warning, it does not work every time on every crack but it doesn't hurt to try.
Do you have a favoriate mending technique?
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