Eleanor on mon 21 aug 06
Firing to ^6 electric, using plenty of kiln wash. 5/8th inch Thorley
shelf.
In a recent glaze firing, a glaze ran, and when I picked up the pot,
some of the shelf came with it. I was able to scrape the glaze off the
shelf, but a shallow depression remains.
How to fix this?
With what?
Does the depression need to be filled?
I suppose I could turn the shelf upside down, but the kiln wash would
have to be removed, which is a pain.
All suggestions appreciated.
Eleanor Kohler------------member Potters Council
Centerport, NY
Heat wave continues on Long Island.
David Hendley on tue 22 aug 06
Reading this while picturing my 30-year-old kiln shelves
brought a smile to my face.
Shallow depression? My kiln shelves have more pock marks
than the year book photo of a high school sophomore. Not
one is crack-free, some have cracks coming from 3 edges,
and not many are flat.
I fill in craters with kiln wash (half alumina and half kaolin).
This is an all-day process - put a single coating in the hole,
let it dry, and repeat as many times as necessary. Then a
final all-over coat on the whole shelf.
Really, a shallow depression makes no difference unless you
are firing a small item and it ends up needing to be placed
right in the area, or one leg of a 3-legged pot ends up in
the hole.
As a temporary measure, just fill the hole with dry alumina
hydrate or silica.
David Hendley
Maydelle, Texas
david(at)farmpots(dot)com
"EXTRUDE IT! Getting the Most From
Your Clay Extruder" available at
http://www.farmpots.com
----- Original Message -----
> In a recent glaze firing, a glaze ran, and when I picked up the pot,
> some of the shelf came with it. I was able to scrape the glaze off the
> shelf, but a shallow depression remains.
> How to fix this?
> With what?
> Does the depression need to be filled?
>
> I suppose I could turn the shelf upside down, but the kiln wash would
> have to be removed, which is a pain.
William & Susan Schran User on tue 22 aug 06
On 8/21/06 8:33 PM, "Eleanor" wrote:
> Firing to ^6 electric, using plenty of kiln wash. 5/8th inch Thorley
> shelf.
>
> In a recent glaze firing, a glaze ran, and when I picked up the pot,
> some of the shelf came with it. I was able to scrape the glaze off the
> shelf, but a shallow depression remains.
>
> How to fix this?
> With what?
> Does the depression need to be filled?
>
> I suppose I could turn the shelf upside down, but the kiln wash would
> have to be removed, which is a pain.
Depending on the size of the depression you could fill with kiln wash mixed
with ground up insulating firebrick.
But even though it's a pain, the best would be to flip and remove kiln wash
from the shelf. If possible, you could flip the shelf and use it as your
bottom shelf and not remove old kiln wash.
What size kiln is this? Anything over 18" diameter firing to ^6, the shelves
will eventually start warping.
-- William "Bill" Schran
Fredericksburg, Virginia
wschran@cox.net
wschran@nvcc.edu
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