Hole in glass using Patty Gray dam

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ginnibobinni
Posts: 7
Joined: Wed Nov 23, 2005 1:08 pm
Location: Venice, California

Hole in glass using Patty Gray dam

Post by ginnibobinni »

Hi,
I emailed Patty but have not received a response. So, I am trying here. I use Patty's 8x10" dam a lot. All the first pieces I've made came out well. The last two pieces have big holes and bubbles in them. I use papyrus as she taught me in her class and store my molds in their original boxes. Please see pics and advise what may have gone wrong. Thank you!
Ginni
PXL_20241126_040008520.jpg
PXL_20241126_035945567.jpg
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Ginni

You can't succeed if you don't try!
Brad Walker
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Joined: Fri Mar 07, 2003 9:33 pm
Location: North Carolina, USA
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Re: Hole in glass using Patty Gray dam

Post by Brad Walker »

Not enough glass. The total glass is less than 6mm thick and that causes the holes.

One solution is to not fire as hot. Also, it helps to do a bubble hold at around 1230F for at least half an hour.
ginnibobinni
Posts: 7
Joined: Wed Nov 23, 2005 1:08 pm
Location: Venice, California

Re: Hole in glass using Patty Gray dam

Post by ginnibobinni »

There was 6mm, 3mm clear base and 3mm strips covering the top.
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Ginni

You can't succeed if you don't try!
Brad Walker
Site Admin
Posts: 1512
Joined: Fri Mar 07, 2003 9:33 pm
Location: North Carolina, USA
Contact:

Re: Hole in glass using Patty Gray dam

Post by Brad Walker »

ginnibobinni wrote: Thu Nov 28, 2024 3:36 pm There was 6mm, 3mm clear base and 3mm strips covering the top.
Still not enough glass for the temperature you fired to.
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