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#1 grayfree

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Posted 05 August 2012 - 12:03 PM

Help please
Yeasterday I sanded off all the old kiln wash I put on when I first got my kiln. It was flaking and uneven and sticking to my pots. I decided to spray on this time which was awesome. I sprayed 2 light coats, did a bisque firing with some pots and was going to add 2 more light coats today. I noticed that the wash just brushes right off and didn't seem to adhere. I did make a mistake and hit fast bisque instead of slow bisque so I was wondering if that was the problem. anyway DO i respray them and just try again on slow bisque??

#2 JBaymore

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Posted 05 August 2012 - 12:34 PM

What is the recipe for your kiln wash?

best,

....................john
John Baymore
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Professor of Ceramics; New Hampshire Insitute of Art

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#3 atanzey

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Posted 05 August 2012 - 05:16 PM

I don't use kiln wash for a bisque load and have never seen any problems. And my wash ALWAYS comes off after firing. What doens't flake loose, I scrape off. I brush on one fresh coat before a glaze load.

Alice

#4 voceramics

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Posted 05 August 2012 - 06:09 PM

Do the shelves just feel dusty or did all the wash come off?

The new kiln wash I purchased had that dusty to the touch affect when first fired. I vacuumed and wiped down the shelves to get the loose dust off. Quite different than the old caked on kiln wash, but it seems to work.
Phuong
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#5 Marcia Selsor

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Posted 06 August 2012 - 10:06 AM

My recipe is 50 kaolin and 50 silica and then I add about 10-20% alumina hydrate and mix it to the consistency of milk. The shelves soak it up quickly.
I only need to clean the kiln wash after a color blushes onto it or something drips. I can usually pop off a drip easily. The blushing from cobalt glazes is necessary so it does not color my porcelain bases. I use a light grinding disc on a drill or dremel for a light cleaning.


Marcia

#6 grayfree

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Posted 08 August 2012 - 10:00 AM

Ok I am sorry I just saw these post today. The kiln wash I use is from Clay King I have no idea what it is made from. The spray went on so nice and smooth. I refired a second time and had the same result with brushing off powder when I brush my hand across the shelve. I am did a glaze firing yesterday and decided to use some kiln paper I bought under a few pots with some new glazes I am trying and was unsure if they would run. Will let you know in a bit how things turn out. Thanks for the replys

#7 JBaymore

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Posted 09 August 2012 - 10:11 AM

If that "kiln paper" you mention is made of refractory ceramic fiber .... do yourself a favor and look up the health information on RCF.

Unless there is a compelling reason to use stuff like that to solve some serious technical issue, where other solutions will nor work, it is not a great idea. You are needlessly getting RCF fiber dust into your environment.

best,


................john
John Baymore
Immediate Past President; Potters Council
Professor of Ceramics; New Hampshire Insitute of Art

http://www.JohnBaymore.com




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