[Clayart] Great Pottery throw down/ mending big lamp base w/ glaze

Robert Harris robertgharris at gmail.com
Sat Jan 29 00:45:29 UTC 2022

Best fix I have tried is to take concentrated sodium silicate and mix with
calcined kaolin until it's a thick batter (you can thin it a little for
reattaching pieces of bisque. Fix any holes you have with this and heat
gently with a hair dryer or heat gun on low. Allow to dry thoroughly
(preferably several hours or overnight). Wash out excess sodium ions with
vinegar or other dilute acid and allow to dry. Then blast it with a blow
torch (heat gently to start). It will occasionally spit and you'll have to
sand down a bit and reapply. I have filled relatively large holes from
squeezing too hard with tongs using this method. I have also fixed rims. As
Snail said, gravity is fairly important, but as long as it's not very load
bearing you can use this method. It will NOT fix S-cracks however, as those
keep expanding.

On Fri, 28 Jan 2022 at 12:50, Snail Scott <claywork at flying-snail.com> wrote:

> > On Jan 27, 2022, at 3:56 PM, Carolyn Curran <cncpots2 at gmail.com> wrote:
> > ...A lot of kiln accidents on the show...I wonder if they time the drying
> > of big pots too quickly to make for more dramatic show....If I  were  the
> > pro in charge of firing,  I would preheat the hell out of the   kiln
> load…
> I cannot imagine they think it is more appealing this way. None of that
> stuff should have blown up with an adequate candling phase, even if it were
> still damp when loaded. We also see a great many cracks induced by
> too-rapid drying.  I am sure there are time constraints for filming, but an
> extra four or so hours of candling would have prevented nearly all the
> steam explosions we have seen.
> -Snail
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