Porcelain Tips

Building onto a form that’s too soft causes slumping. Adding softer clay onto a form that is too dry results in cracking. Altering and/or bending a form that’s too dry or leather hard causes warpage and cracking.

In general, join only pieces of similar dryness and reinforce all joints with extra clay and compress them together with a rib.

Slow and even drying is critical. Periods of rest, where the pieces are wrapped in an airtight chamber to slow drying and redistribute moisture, do help. The clay has a chance to get used to its new form at each phase, without having one part dry too quickly for the rest of the piece.

Another valuable technique is to restrict movement of the piece during the drying phase.

 

All information in this post is a direct copy from the website stated below:

http://ceramicartsdaily.org/ceramic-supplies/pottery-clay/persnickety-porcelain-how-to-minimize-your-loss-rate-with-this-gorgeous-yet-difficult-material/