Kiln Shelf - WarmGlass.com

Kiln Shelf

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johnboy2017
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Joined: Wed Aug 23, 2017 6:24 pm

Kiln Shelf

Postby johnboy2017 » Wed Sep 13, 2017 6:34 am

Need some advice. :D New to it

I used to use Thinfire paper when fusing my glass but got like mucky lines around the fused glass. Looked into it and change to using primo primer instead but the glass on the bottom side has rough and sharp edges which I never got with using the paper.

I apply 5 coats of the primo, drying each coat but not sure how to get around this


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jim simmons
Posts: 409
Joined: Sun Mar 09, 2003 10:37 pm
Location: Hillsboro Oregon
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Re: Kiln Shelf

Postby jim simmons » Wed Sep 13, 2017 2:07 pm

I don't know about the Primer, but to get around the murky edges, have you noticed that this only happens when you have a ground edge?
Either don't grind, or manually polish the edges before firing.
Use a very find grit to do the final grind and it should be fine.
The other Jim

DonMcClennen
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Joined: Sun Mar 09, 2003 9:09 pm
Location: Ontario

Re: Kiln Shelf

Postby DonMcClennen » Wed Sep 13, 2017 3:56 pm

First of all you don't have to dry the shelf primer between each coat. I usually do about 6 coats all at the same time alternating brushing direction each coat.. then dry (sit out in sun, or sit on top of kiln when your firing something else) Once it is dry run your dry hand over gently to reduce brush ridges.
Needles at edge are usually caused by not enough glass volume... Get yourself the Warm Glass Fusing (Brad Walker) book .. a lot of your problems will be addressed!
"The Glassman"

johnboy2017
Posts: 3
Joined: Wed Aug 23, 2017 6:24 pm

Re: Kiln Shelf

Postby johnboy2017 » Wed Sep 13, 2017 5:44 pm

Thanks for responses

In relation to the mucky lines they show a fine line round the whole piece straight, like an outline . Not always around the whole thing. They come out nicely formed

With the kiln wash, there are no lines so don't think it's a grinding thing.

Can't understand why the paper would cause this issue and kiln wash doesn't

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jim simmons
Posts: 409
Joined: Sun Mar 09, 2003 10:37 pm
Location: Hillsboro Oregon
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Re: Kiln Shelf

Postby jim simmons » Wed Sep 13, 2017 5:48 pm

Because the paper fumes are trapped in the microscopic bubbles caused by the voids left by the coarse grinding head.
Kiln wash doesn't have any fumes to get trapped.
The other Jim

johnboy2017
Posts: 3
Joined: Wed Aug 23, 2017 6:24 pm

Re: Kiln Shelf

Postby johnboy2017 » Wed Sep 13, 2017 5:56 pm

Even if they are freshly cut pieces not grinded but cleaned before being put in the kiln

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Valerie Adams
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Location: Santa Rosa, California
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Re: Kiln Shelf

Postby Valerie Adams » Thu Sep 14, 2017 12:49 pm

I stopped using fiber paper and my issues stopped. Now, if for some reason I have to use paper, I simply vent the kiln while firing.


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