Roger Korn on sat 6 apr 02
I have had wonderful results with this stuff, replacing whole missing sections of
grooved brick in electric kilns with a mix of 421 and softbrick grog plastered over
a piece of rope covered with overhead projector plastic film to mold the correct
shape for the element groove. After multiple firings, all of these jobs are holding
up just great.
Thinned out, I have sprayed it over totally funky surfaces with a sandblast gun,
then fired the kiln, then coated with a light coat of ITC100HT. Holds up way better
than I had any right to expect.
Roger
vince pitelka wrote:
> > Maggie is structurally sound, but there are cracks in the brick walls, a
> > number of them mostly in the rear wall and sides. The bricks of the arch
> and
> > door are crack free. Cracks seem to vary between hairline thickness (no
> > prob) and 1/8" at the thickest. You cannot see more than 1/2 a brick's
> > thickness 'into' these fissures, so it appears at most that there would be
> > some efficiency loss due to these defects, rather than a safety or
> > structural hazard.
>
> Mark -
> It is worth it to take the time to fill the cracks. Don't mess with "gunned
> on" coatings unless you want to give the kiln a coat of ITC. It is sprayed
> on in a very thin layer. Just get a small supply of high-duty refractory
> patching compound, like APGreen Greenpatch 421. It is still being sold by
> Harbison-Walker, and most good refractory suppliers have it in stock. Wet
> the adjacent surfaces very thoroughly with a sponge or spritz bottle, and
> then work the Greenpatch into the cracks with a sturdy spatula. It adheres
> extremely well, and will last as long as the brick.
>
> If the burners and safety systems on the kiln are working fine, then don't
> mess with them. When it does become necessary to upgrade them, get rid of
> those ridiculous porcelain burner tips inside the firebox. Back off the
> burner mounts, replace the burner tubes, and mount normal threaded
> flame-retention nozzles on the tubes, with the tips about 1/2" outside the
> burner port. That is a much superior system.
> Good luck -
> - Vince
>
> Vince Pitelka
> Appalachian Center for Crafts
> Tennessee Technological University
> 1560 Craft Center Drive, Smithville TN 37166
> Home - vpitelka@dtccom.net
> 615/597-5376
> Work - wpitelka@tntech.edu
> 615/597-6801 ext. 111, fax 615/597-6803
> http://www.craftcenter.tntech.edu/
>
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--
Roger Korn
McKay Creek Ceramics
In AZ: PO Box 463
4215 Culpepper Ranch Rd
Rimrock, AZ 86335
928-567-5699 <-
In OR: PO Box 436
31330 NW Pacific Ave.
North Plains, OR 97133
503-647-5464
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