I actually found this post on my first try, from the last time we
discussed this on clayart. the quote below is to the best of my
memory from John Britt:
301 Turner Street
Utica NY 13502
Contact: Ed or John
Scott Martin - Inside Sales
Phone: (800) 445-2424 ext 277
Fax: (315) 797-4848
I have used it for mending jobs. This note below on clayart late '06 that
sent me looking for it. I used it mixed with EPK to glue kaoboard pieces
Please note, you all! The most effective "RIGIDIZER" for any application
using ceramic fiber is "collidial silica" which is produced through
ionization of "sodium siclica" I have used clear
liquid collidal silica for endless applications for more than 4 decades.
For example, one of my electric kiln lids, started to crack. I simple
applied collicial silica into the crack; after the next firing, Bingo! The
lid is repaired totally, no more cracking or shifting movement of the kiln
Yes milled zircon is zircopax-just ground up more.
This coating will work well with coating kao-board
I use it at cone 11 on brick and fiber
Where did you get your gallon of colloidal silica?
Laguna Clay Co. sells milled zircon as well.
On Jun 4, 2012, at 7:01 AM, Eleanora Eden wrote:
This is such a welcome idea. I bought a gallon of colloidal silica
a few years ago and have used a tiny bit of it combined with I think
kaolin and flint for a surface treatment and as a glue. I will be trying
your recipe very soon. I googled zircon powder and it seems it is
I have lots of things to use this on but my most immediate quest is
for a better kiln wash for glass. Especially my little kao-board microwave
glass cooker. I coated the outside with itc 200 (I think) immediately as the
outsides seemed to degrade when you look at it, and that has worked very
well indeed. Now I want a better coating for the firing surface. I hate firing
on the kaowool paper and have been using regular kiln wash but that doesn't
stick worth squat. I bet this will work very well.
Am just putting in a ^04 kiln firing and am thinking of making up a tiny bit,
applying it to a scrap of kao-board, and seeing how it goes.
I agree with Mel's post on ITC-really great stuff-I have used it a bunch
Here is another coating that I have use a lot as well.
This stuff sticks and stays stays put even in fireboxes.
I got this recipe from a glassblower who coated his glory hole of soft
brick and fiber and have coated both with it with good results.
Liquid COLLOIDAL SILICA mixed with milled ZIRCON
1 gallon is plenty of the liquid is plenty to buy.
start out by vacuuming kiln then spray all soft brick with water via a
mister bottle so its slightly damp. if its warm out only do the area
ahead of your application.
Start with a small say cereal bowl 1/2 full of colloidcal silica about
3/4 cup -This will be your learning curve batch-
add milled zircon powder to this until its like heavy cream (this
liquid absorbs a huge amount of powder)-use a wider brush and apply a
coat to damp area bricks- coat kiln -let dry then bisque fire.
This mix works as the best coating I have ever seen or used-Its a bit
hard to brush and will ruin your bowl and brush but will stick to just
about anything-It can be sprayed as well. Work it into all cracks as
its acts like a glue as well.
Use a respirator when spraying. It covers my soft bricks and rarely
spalls (comes off)
You will not find this pre made and must make your own from scratch.
Good luck-this stuff works. Its about 100% better than any other wash
you may want to apply to a kiln.
These ingredients are a bit harder to find but worth it.I still use
and like ITC but this stuff also has its place.