I get asked this question a lot:
“How do you actually fuse glass?”
Not so much what fused glass is — I’ve talked about that before — but what the process really looks like from start to finish.
And the honest answer is: it’s part planning, part creativity, part chemistry, and a whole lot of learning by doing. The kiln is always involved, and it always has opinions.
Here’s how fusing glass typically works, the way I explain it at my art shows.
It Starts With an Idea (Not a Perfect One)
Every fused glass piece starts with an idea. It can be a perfectly drawn sketch or a rough idea — but a lot of times, it's really just a starting point.
Sometimes that idea is:
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A bold color combination
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A shape or type of item (like a pendant, earrings, or wall panel)
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Or simply wanting to see what happens when certain glass is fired together
If you’re new to fused glass, this is important to hear: you don’t need to have it all figured out before you start. Some of the best pieces come from leaving a little room for experimentation.
Choosing Glass That Works Together
Not all glass can be fused together safely. When you’re fusing glass, compatibility matters.
Fusible glass is made to expand and contract at the same rate as it heats up and cools down in the kiln. That’s why most people work with glass labeled as COE 90 or COE 96 and don’t mix the two.
This is also where color choices come into play. Opaque and transparent glass behave differently, and some colors react with others in surprising ways.
Even after 20 years of fusing, I still test glass. The kiln is always part of the decision-making process.
Cutting, Layering, and Designing
Once the glass is chosen, it’s time to build the piece.
This usually means cutting glass, layering it, and arranging the design on a kiln shelf. You might add frit, stringers, or other details depending on the look you’re going for.
This is the stage where beginners often feel like they’re “doing it wrong.” They’re not.
Simple designs are a great place to start. Clean shapes and thoughtful color choices go a long way in fused glass.
The Kiln Is Where the Magic (and Science) Happens
After the glass is assembled, it goes into the kiln.
The kiln slowly heats the glass until it melts and fuses together, then cools it back down just as slowly. This controlled heating and cooling is what prevents stress and cracking.
Different firing schedules create different results:
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A full fuse melts the glass smooth
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A tack fuse keeps texture and dimension
This part of the process takes time and patience. You don’t rush a kiln, and you don’t always get instant answers. What you do get is experience.
Opening the Kiln Never Gets Old
Unloading the kiln is always an exciting moment.
Sometimes a piece turns out exactly the way you imagined. Sometimes it surprises you. And sometimes it teaches you what not to do next time.
This is how you really learn fused glass — by seeing the results and adjusting as you go.
Finishing the Piece
Many fused glass pieces aren’t finished the first time they come out of the kiln.
They may need:
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Edges ground smooth
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Holes drilled
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Additional firings
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Or other finishing work
This final stage turns a fused piece into something that’s ready to wear, use, or display.
What Fusing Glass Teaches You
Fused glass isn’t just about melting glass together.
It teaches patience. It teaches problem-solving. And it teaches you to let go of perfection and trust the process.
Every piece is a conversation between you, the glass, and the kiln — and that’s what keeps people coming back to it.
If you’ve been curious about trying fused glass but feel intimidated, know this: you don’t need to know everything to start. You just need a place to begin.