Slip casting straight walls
Hi All
I just began slip casting block forms from stoneware slip and it has been going well for my first time. I’m having the problem that while they are drying, the edges are warping and no longer staying square.
I left them to dry in the mould for 4 hours before demolding as I thought there may be thicker clay on the edge below, so the walls are ‘sinking’ as it dries.
I am using both red and white slip, and it happens a lot more with the red. Does anyone have any ideas? Shoul
Possibly a bad thing. When it glugs it creates a vacuum, which tries to pull the casting off the mould. Large flat surfaces would be especially susceptible to this.
Does pouring more slowly/gently reduce the glugging?
Does the glugging happen very early in the pouring? If so try bailing/decanting out some of the slip before pouring, as the gurgling might relate to the shape around the top of the mould.
PS Does your slip gel-up in the mould at all?
[Years ago I had a batch o