Coke & Corona Bottle Slump - WarmGlass.com

Coke & Corona Bottle Slump

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cookies4b
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Joined: Sun Nov 08, 2020 1:19 pm

Coke & Corona Bottle Slump

Postby cookies4b » Sun Nov 08, 2020 2:05 pm

Hi, I’m totally new to bottle slumping & I was wondering what I am doing wrong that my painted Coca Cola labels burn completely off of the back, while the red burns off of the front leaving only the white. Meanwhile, my painted Corona labels stay on in the front but the back labels burn into my mold. Does anyone have any tips on a firing schedule that works to keep the paint on & save my molds? Or is theresomething I can coat the labels with? Thanks!

Brad Walker
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Re: Coke & Corona Bottle Slump

Postby Brad Walker » Sun Nov 08, 2020 3:49 pm

Many bottles use a paint that doesn't behave well in the kiln. Reds are especially problematical.

If you give us the schedule you used we may be able to make some suggestions, but my guess is that changing the schedule won't do much -- it's just the nature of the paint used on the bottles themselves.

cookies4b
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Joined: Sun Nov 08, 2020 1:19 pm

Re: Coke & Corona Bottle Slump

Postby cookies4b » Sun Nov 08, 2020 10:51 pm

I’ve been using:
1-500°,1100°,10
2-250°,1300°, 5
3-300°,1425°, 5
4-full, 950°, 40

Brad Walker
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Re: Coke & Corona Bottle Slump

Postby Brad Walker » Mon Nov 09, 2020 8:54 am

That schedule looks pretty much ok to me, except I would anneal bottles at 1000, not 950.

About the only thing I can think of for you to try would be to see if you can get the slump at a slightly lower top temperature. That might help with the paint burning off, but my guess is that the paint is going to burn off anyway.

cookies4b
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Joined: Sun Nov 08, 2020 1:19 pm

Re: Coke & Corona Bottle Slump

Postby cookies4b » Mon Nov 09, 2020 3:12 pm

Thanks for your input! Just curious, why 1,000 instead of 950?
Also, sometimes I peek in (I can’t see much, it’s a tiny window) & my bottle has already slumped before step 3,,, so maybe I do need a lower temp in 1/2

Brad Walker
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Re: Coke & Corona Bottle Slump

Postby Brad Walker » Mon Nov 09, 2020 3:30 pm

cookies4b wrote:Thanks for your input! Just curious, why 1,000 instead of 950?


Because different glasses have different annealing temperatures. 950 is ok for art glasses like Bullseye and Spectrum, but 1000 is best for window and bottle glass.

Also, sometimes I peek in (I can’t see much, it’s a tiny window) & my bottle has already slumped before step 3,,, so maybe I do need a lower temp in 1/2


It the bottle has already slumped, you can just skip to the next step and start cooling down to your annealing temperature. So a lower temp would do the same thing.

cookies4b
Posts: 4
Joined: Sun Nov 08, 2020 1:19 pm

Re: Coke & Corona Bottle Slump

Postby cookies4b » Tue Nov 10, 2020 7:25 am

Thank You So Much! I’ll try a new schedule & see what happens!

Doug Finner
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Re: Coke & Corona Bottle Slump

Postby Doug Finner » Tue Nov 17, 2020 2:11 pm

cookies4b wrote:I’ve been using:
1-500°,1100°,10
2-250°,1300°, 5
3-300°,1425°, 5
4-full, 950°, 40


I found a basic bottle slump somewhere on the web that was similar to this.

1-500°,1100°,10
2-250°,1300°, 20
3-full,1475°, 5
4-full, 1000°, 60

It's worked well for my needs (stick a wire into the neck before firing, fire, hang as a gigantic wind chime element. I've used this profile for everything from small olive bottles up to 1/2 gallon milk bottles. Sometimes glass patterns and/or labels remain visible, sometimes not. The bottom usually falls over onto the bottle side and is a bit of a bump at the bottom. Since I'm not going for anything artistic, none of these are problems. I don't remove labels and just allow them to fully or partially burn off; sometimes they melt into the glass which can be interesting.


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