BHannis on wed 8 aug 12
Opps; my bisque kiln over fired a load of pots, maybe as high as cone
6. How does one glaze these successfuly for a cone 10 gas firing??
Bryan Hannis
JRodgers on thu 9 aug 12
I mistakenly fired a piece to cone 6 once instead of the 06 that i
customarily fire to for bisque. I added some CMC to my glace of choice,
warmed the bowl to 100 degrees, then sprayed it with the cmc glaze. The
cmc made the glaze stay put in handling to load the kiln. I sprayed
three coats, drying in between each coat. Firing to maturity worked out
fine. Had a nice bowl after. Just my experience.
John
On 8/8/2012 3:07 PM, BHannis wrote:
> Opps; my bisque kiln over fired a load of pots, maybe as high as cone
> 6. How does one glaze these successfuly for a cone 10 gas firing??
>
> Bryan Hannis
>
gsomdahl on thu 9 aug 12
Been there, done that. Couple off things that I tried that partially
worked: 1. Heat the pots before glazing. 2. Use a thin glaze, dip, and
let dry. Then repeat several times.
When refiring a high fired pot with with an additional glaze I apply a
coat of something sticky to catch the glaze.
Gene Somdahl
On 08/08/2012 03:07 PM, BHannis wrote:
> Opps; my bisque kiln over fired a load of pots, maybe as high as cone
> 6. How does one glaze these successfuly for a cone 10 gas firing??
>
> Bryan Hannis
>
--
This is a post only account. Send replies to "gene" at my ".com" domain nam=
ed "somdahl".
Ben Morrison on thu 9 aug 12
BHannis,
Actually a lot of the obstacles are overcome by the slurry consistency, and=
how it's mixed. By using a low amount of water and a deflocculant you can =
get glaze to better stick to even vitrified pots. I add about 10 to 20 drop=
s of sodium silicate to my glaze with about 50% of the batch weight in wate=
r. I mix thoroughly and then begin to thin slowly in small increments until=
it hangs on my vitrified test tiles in the desired thickness.
Another method, or a further step that can be taken is to turn your kiln on=
low, load it with your pots to be glazed. allow them to get hot, then turn=
the kiln off. When you glaze the hot pot, more glaze will stick to the sid=
e and dry faster.
-Ben
________________________________
From: BHannis
To: Clayart@LSV.CERAMICS.ORG
Sent: Wednesday, August 8, 2012 1:07 PM
Subject: glazing over fired bisque ware???
Opps; my bisque kiln over fired a load of pots, maybe as high as cone
6. How does one glaze these successfuly for a cone 10 gas firing??
Bryan Hannis
James Freeman on fri 10 aug 12
Bryan...
I routinely fire my bare sculptural pieces to cone 6, often with a cone 6
liner glaze, and then re-fire them to cone 6, 04 or 06, or some subset
thereof. I tried all of the usual suggestions, thick glaze, sticky stuff,
et cetera. Some worked, to an extent, some didn't, but none were really
satisfactory. The method I finally came up with is simple and pretty much
foolproof, and uses your ordinary glaze. It does, however, assume that you
spray your glazes.
I place my vitrified pot on the banding wheel in my spray booth, then heat
it with a propane torch (the kind sold at home centers for soldering
pipes). I then mist on a thin coat of glaze which I then dry with the
torch, thereby reheating the pot at the same time. Mist on another coat of
glaze. You will notice that this second coat will build thicker than the
first, because the underlying dried glaze helps to absorb moisture from the
new coat. Again, dry the new coat with the torch. Repeat this sequence as
many times as necessary. Each subsequent coat will build thicker than the
previous one, and toward the end you will hardly even need to dry it with
the torch. I usually spray about 6 coats in this fashion, but it will
depend on the glaze you are using. You can gauge the thickness of the
glaze coat by poking it with a needle tool, though I just use the Zen
approach.
I have also used this method with a brushed on glaze, and it worked just
fine. This was, however, a commercial glaze, and not sure if that makes
any difference. I am not sure if this method would work with dipping. It
seems that one would have to dip rather quickly, or the underlying coats
may just dissolve away. There is a lot more moisture involved in a dipped
glaze as compared to a sprayed one.
Good luck.
...James
James Freeman
"Talk sense to a fool, and he calls you foolish."
-Euripides
http://www.jamesfreemanstudio.com
http://www.flickr.com/photos/jamesfreemanstudio/
http://www.jamesfreemanstudio.com/resources
On Wed, Aug 8, 2012 at 4:07 PM, BHannis wrote:
> Opps; my bisque kiln over fired a load of pots, maybe as high as cone
> 6. How does one glaze these successfuly for a cone 10 gas firing??
>
> Bryan Hannis
>
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