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mnnaj

Member Since 29 Aug 2012
Offline Last Active Jun 21 2015 06:59 PM
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#87322 Removing Greenware From Ceramic Mold Questions

Posted by mnnaj on 17 June 2015 - 03:34 PM

I've made vases about 18" and 14" tall, not cone shaped though.  

Sometimes as you pour the excess slip out it will 'glug' causing the soft slip to pull away from inside the mold.  Be very careful and slow as you do the pouring.  

Experience will show you how long to let the slip stay in the mold before you decant it.  I found that the drier my mold, the less time I had to let it set up.  

Perhaps one of your mold pieces has something on it that resists water, that can slow the movement of moisture into the plaster and cause thin/weak spots.

Nancy




#87312 Removing Greenware From Ceramic Mold Questions

Posted by mnnaj on 17 June 2015 - 01:49 PM

I have been able to rub the pinholes out at greenware.  Depending on what your mold looks like will depend on if your piece will crack.  How many pieces is your mold?  Is it mostly enclosed or have a large open area?  I have had some luck on a 3 piece mold taking one side and the bottom off, leaving the other side horizontal with the piece still inside of it. Then putting the first side back on and flipping it and exposing the wetter side to air.  

You can reclaim the botched and dried pieces - takes time, but it can be done.

It takes practice and time to make good slipware.  Good luck

Nancy