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Dealing with Devitrification

For discussion and commentary regarding the Lesson and Project videos of the Bullseye Kiln-Glass Education Online program.

Dealing with Devitrification

Postby Chris_Petrauskas » Thu Apr 10, 2014 9:26 am

Watch the Lesson at:

Please discuss and comment in this thread.

Chris Petrauskas
Bullseye Glass Co.
Portland, Oregon, USA
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Re: Dealing with Devitrification

Postby jestersbaubles » Thu Apr 10, 2014 7:11 pm

Few comments/questions.

* Interesting that the glass cleaner you show as potentially "questionable" is one that many people recommend. I just purchased four cans, but maybe I won't use them :mrgreen: -- at least as the final cleaner. I've always used a generic "windex" type of cleaner to clean glass before cutting, then I take to the sink with a green scrubby and often just water prior to putting in the kiln. I have rarely had problems with devit (there, I've just jinxed myself!).

* Has anyone tested armor etch/etch all as a substitute for sandblasting? I've tried once, without much success, but it might have been my technique.

* Why no mention of devit sprays or homemade concoctions?

Thanks for the valuable information Bullseye continues to provide in its videos.

Dana W.
Dana Worley Fused Glass Designs
dba Jester's Baubles
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Re: Dealing with Devitrification

Postby little.glass.shack » Tue Apr 15, 2014 4:20 pm

I have not been successful with using the clear powder. Even with a very light dusting, it traps small bubbles and gives me a cloudy surface. Any recomendations as to how to use the powder more effectively?
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Re: Dealing with Devitrification

Postby charlie » Tue Apr 15, 2014 6:39 pm

use something larger than powder. there's a lot more surface area to volume on powder, and the surface traps very tiny air bubbles.
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Re: Dealing with Devitrification

Postby grossscore » Tue Apr 15, 2014 7:21 pm

I have used Armour etching cream....paint it on as per directions and then retire....works every time....must be like sandblasting.
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Re: Dealing with Devitrification

Postby grossscore » Tue Apr 15, 2014 7:22 pm

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Re: Dealing with Devitrification

Postby marykaynitchie » Wed Apr 16, 2014 7:57 am


Mary Kay
Mary Kay Nitchie
Bullseye Glass Co.

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Re: Dealing with Devitrification

Postby Timmermanms » Mon Apr 21, 2014 11:13 pm

What was the name if thar grinding appratious you should?
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Re: Dealing with Devitrification

Postby HERBFELL » Mon Oct 27, 2014 4:41 am

I do a quick sanding with a piece of diamond sandpaper. 200 to quickly remove the devit, 400 to make it scratch free when refired. I bought this batch of diamond sandpaper leftovers from ?? (it's so long ago, I don't remember, but it's one of the bigger online sellers).

Best $30 I ever spent, still haven't worn out the first 2 pieces!
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Re: Dealing with Devitrification

Postby sandraklafond » Mon May 22, 2017 7:41 am

I'm not sure if I'm dealing with devit. My pieces are coming out glossy on top, but not on the bottom/shelf-side. Im careful about cleaning my glass and priming my shelves. I pre-fire them to 500 degrees. Im using a pre-set fuse schedule. Im new to fusing. Id flip and fire, but worry that if i do so, my glossy side will lose its gloss on the shelf. Help!
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Joined: Fri Apr 14, 2017 1:27 pm


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