[Clayart] Porcelain slip on platters cracking

Cyndy Shorter via Clayart clayart at lists.clayartworld.com
Mon Jul 27 12:54:29 EDT 2015


I am getting ready to make another batch of slip this afternoon and will
add the Darvin as directed. Thank you everyone for all your suggestions!
On Jul 27, 2015 12:41 PM, "PETER HAMER via Clayart" <
clayart at lists.clayartworld.com> wrote:

> Video showing just how much extra clay you can add when using a
> deflocculant.
> https://www.youtube.com/watch?v=3an-E0Lk8mQ
>
> Regrads, Peter
>
> ----Original message----
> From : clayart at lists.clayartworld.com
> Date : 27/07/2015 - 01:29 (BST)
> To : clayart at lists.clayartworld.com
> Subject : Re: [Clayart] Porcelain slip on platters cracking
>
> I concur Cyndy. You need to deflocculate the slip to keep it
> from cracking.
> What deflocculation does is allow you to make a thicker
> slip with less water that will still flow easily when you apply it.
> Less water means less shrinkage on drying, hence no
> cracking!
> David Hendley
> david at farmpots.com
> http://www.farmpots.com
>
>
> ----- Original Message -----
>
> > Hi Cyndy,
> >
> > I used to decorate platter with slip made from the same clay. I let  the
> > platters dry to about trimming hardness then slip trail - allow to  dry
> > for a day and then
> > trim. I found I had to deflocculate the slip or the slip would crack.
> >
> > I can send you instructions on how I deflocced the slip.
> >
> > RR
> >
> > Quoting Cyndy Shorter via Clayart <clayart at lists.clayartworld.com>:
> >
> >> Hey all! I am attempting to slip decorate large platters. I use the
> >> trimmings from my porcelain to make slip. So I am staying in the same
> >> clay
> >> body. Vases, pitchers, and anything else vertical, no issues. But large
> >> platters are getting frustrating. I wrap in plastic and dry as slow as
> >> possible, but still get cracks. I slip immediately following throwing,
> so
> >> I
> >> am reasonably close in moisture content. Does anyone have a suggestion?
> >> The
> >> clay itself does not usually crack unless I attempt to dry too fast.
> >> MAILMAN_MIMEDEFANG WRAP
>
> MAILMAN_MIMEDEFANG WRAP
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