Walking into a glass supply shop or browsing online can feel wonderfully overwhelming. You’re met with a rainbow of colors, shimmering iridescent surfaces, and dazzling dichroic patterns. But how do you choose the right glass for your project? While color and texture are the fun part, the most important decision is a technical one. To create a successful piece, you need to understand the science of compatibility. This guide will help you look past the initial beauty of the fusible glass sheets and teach you how to select materials that will not only look great but will also survive the heat of the kiln.

Key Takeaways

• Stick to a Single COE: To prevent cracks, every piece of glass in your project must have the same Coefficient of Expansion (COE). Keep your COE90 and COE96 glass completely separate to ensure your finished work is strong and stable.
• Prioritize a Clean Start and Slow Finish: Two steps are critical for a flawless result: thoroughly cleaning your glass to prevent blemishes and using a proper firing schedule. Rushing the cooling (annealing) process is a common mistake that leads to thermal shock and cracks.
• Make Safety a Habit: Your creative space must also be a safe one. Always wear safety glasses when cutting glass, use a dust mask when needed, and ensure your kiln has proper ventilation to protect you from fumes and airborne particles.

What is Fusible Glass?

If you’ve ever been captivated by a vibrant, layered glass dish or a sparkling piece of glass jewelry, you’ve likely seen fusible glass in action. Simply put, fusible glass is a type of glass specifically manufactured to be melted (or fused) together in a kiln. This process allows artists to combine different colors, shapes, and textures of glass into a single, cohesive piece. It’s the key ingredient for a whole world of creative projects, from intricate wall art to beautiful, functional homewares. But not just any glass will do; it has to be “fusible.”

Fusible vs. Regular Glass: What’s the Difference?

The most important difference between fusible glass and regular glass (like window panes or bottles) comes down to one critical factor: its Coefficient of Expansion, or COE. The COE measures how much a piece of glass expands when heated and shrinks as it cools. For a fusing project to be successful, every piece of glass you use must have the same COE. If you mix glass with different COEs, they will shrink at different rates, causing stress that can lead to cracks or even shatter your project. Fusible glass is tested to ensure it has a consistent COE, which is why you’ll see it labeled as COE90 or COE96.

Common Thicknesses and Sizes

When you start shopping for fusible glass, you’ll find it comes in a few standard sizes and thicknesses. Most sheets are about 3mm thick, which is a great, versatile thickness for a wide range of projects. Common sheet sizes you’ll see are 12″x12″, 10″x11.5″, and 10.5″x10.5″, though you can often find smaller cuts or even larger sheets if you need them. These standard sizes make it easy to plan your designs and estimate how much glass you’ll need. For larger projects, you can always inquire about custom options, but starting with these common dimensions is perfect for most artists, especially when you’re just getting started with your first kiln.

Types of Fusible Glass

One of the most exciting parts of glass fusing is choosing from the incredible variety of glass types available. Each one offers a unique look and feel, giving you a rich palette to bring your creative ideas to life. From glass that sparkles to glass that glows, understanding the different types will help you select the perfect material for your project. You can use them alone or layer them to create stunning, one-of-a-kind effects. Let’s look at some of the most popular options you’ll encounter.

Transparent vs. Opalescent

Transparent and opalescent are two of the most common types of fusible glass you’ll work with. Transparent glass is completely see-through, allowing light to pass through clearly. This makes it perfect for layering colors, as the hues underneath will show through and blend in beautiful ways. Opalescent glass, on the other hand, is milky and opaque. It diffuses light rather than letting it pass straight through, creating a soft, solid appearance. Opalescent glass is ideal when you want a solid block of color or need a background that won’t show what’s behind it. Many artists use both to create depth and contrast in their work.

Dichroic

Dichroic glass is the showstopper of the fusing world. It’s coated with incredibly thin layers of metallic oxides that cause the glass to display different colors depending on the viewing angle. One piece of dichroic glass can shimmer with a spectrum of colors as it moves in the light, creating a dazzling, almost magical effect. This makes it a favorite for jewelry, pendants, and decorative accents that are meant to catch the eye. You can get it in various patterns or on a black or clear base, giving you endless creative possibilities for adding a pop of brilliance to your fused glass art.

Iridescent

Iridescent glass has a special surface treatment that gives it a shimmery, rainbow-like luster, much like an oil slick on water or the inside of a seashell. This effect is more subtle than dichroic glass but adds a beautiful layer of depth and elegance to any piece. The iridescent coating is fused onto the surface and can be placed face up or face down in the kiln to achieve different results. When fired with the coating exposed, it maintains its metallic sheen. It’s a wonderful way to add a touch of shimmer and sophistication to your projects without overwhelming the design.

Textured

Textured glass adds another dimension to your work: touch. This type of glass comes with a pattern pressed into its surface, ranging from gentle waves and ripples to more defined geometric designs. You can use this texture to create visual interest and play with how light reflects off your piece. During firing, you have a choice: you can fuse the glass just enough to retain the texture, or you can fire it at a higher temperature to flatten it out completely. Using textured stained glass that is also fusible is a great way to add complexity and a unique tactile quality to your fused art.

COE: The Golden Rule of Glass Fusing

If there’s one non-negotiable rule in glass fusing, it’s this: you must use glass with the same Coefficient of Expansion (COE) in a single project. Think of it as the secret language that glass pieces use to communicate inside the kiln. When they all speak the same language, they work together beautifully. When they don’t, things can get messy. Understanding COE is the first and most important step to creating fused pieces that are strong, stable, and free of cracks.

What is COE?

COE stands for Coefficient of Expansion. In simple terms, it’s a measurement of how much glass expands when it gets hot and shrinks when it cools down. Every piece of fusible glass is tested and assigned a COE number, like 90 or 96. A higher number means the glass expands and contracts more. Think of it like two people holding hands while walking. If they walk at the same speed, everything is fine. But if one person suddenly starts running while the other stops, they’ll be pulled apart. The same principle applies to glass in a kiln, where compatible movement is key to a successful fusion.

COE90 vs. COE96: What’s the Difference?

The two most common systems you’ll encounter in the world of glass fusing are COE90 and COE96. The main difference is simply their rate of expansion. Neither one is inherently better than the other; they just offer different color palettes and product lines from various manufacturers. For example, Bullseye Glass is known for its extensive COE90 collection. Most artists choose one system and stick with it to build their glass inventory. This makes it easy to ensure all your pieces, from sheets to frit, are compatible. You’ll find a huge variety of colors and styles available in both COE96 and COE90.

Why You Can’t Mix COEs

This is where the golden rule comes into play. If you try to fuse a piece of COE90 glass to a piece of COE96 glass, they will expand and shrink at different rates inside the kiln. As the project cools, this difference creates immense internal stress. The two pieces of glass are literally pulling away from each other. This tension will almost always cause your project to develop cracks or, in some cases, shatter completely. To avoid this heartbreaking outcome, always double-check that every single piece of glass going into your project has the exact same COE.

Popular Fusible Glass Brands

When you start exploring the world of fusible glass, you’ll quickly notice a few brand names that pop up again and again. While there are many fantastic glass manufacturers out there, some have become industry standards because of their consistent quality, stunning color palettes, and reliable compatibility. Think of them as the trusted friends of the glass fusing world. Getting to know these key players will help you make informed choices for your projects. The brand you choose often depends on the COE you work with and the specific aesthetic you’re aiming for. Let’s look at three of the most popular brands you’ll encounter in your glass fusing journey.

Bullseye Glass (COE90)

If you work with COE90 glass, you’re definitely familiar with Bullseye. This brand is a giant in the industry, celebrated for its exceptional quality and rigorous testing. Artists love Bullseye because it’s incredibly reliable; you know what you’re getting every time. Their colors are famously vibrant and consistent from one sheet to the next, which is crucial for creating cohesive pieces. Beyond sheets, they offer a complete system of compatible products, including frit, powders, and stringers. This makes it easy to expand your creative toolkit without worrying about compatibility issues. When you build your project with COE90 glass, you can fire with confidence, knowing everything is designed to work together perfectly.

Oceanside/CBS Dichroic Glass (COE96)

For artists in the COE96 camp, Oceanside Glass & Tile is the go-to brand. If the name Spectrum Glass rings a bell, Oceanside is its successor, carrying on the legacy by using their beloved formulas. This makes their glass a versatile and reliable choice for any project requiring a COE of 96. Oceanside is also well known for its partnership with Coatings by Sandberg (CBS) to produce spectacular dichroic glass. This glass has a special metallic coating that shimmers with different colors depending on the angle you view it from, adding a magical quality to any piece. Using COE96 glass gives you access to a huge range of colors and effects, all tested for compatibility.

Wissmach Glass

Wissmach Glass is a historic American brand that has earned a special place in the hearts of many glass artists. What makes Wissmach particularly interesting is that they produce glass in both COE90 and COE96, though you must still keep them separate in your projects. This flexibility allows you to find their beautiful textures and rich colors regardless of which COE system you prefer. Known for its quality and affordability, Wissmach is an excellent option for artists at any level. Whether you’re looking for a classic opal or a unique texture, their extensive catalog of stained glass and fusible sheets offers plenty of inspiration for your next creation.

Is Fusible Glass the Same as Stained Glass?

This is a fantastic question, and the short answer is no. While they can sometimes look similar, the core difference lies in how you work with them. It all comes down to the technique: stained glass is assembled, while fusible glass is melted. This fundamental distinction changes everything, especially regarding which types of glass you can use together.

In a traditional stained glass project, you cut individual pieces of glass and join them using materials like copper foil or lead came. The glass pieces sit next to each other, held securely in a framework, but they never actually melt together. Because each piece remains independent, you don’t have to worry about its Coefficient of Expansion (COE). The solder lines and lead came are flexible enough to absorb any tiny movements as the glass expands or contracts. This is why you can mix and match different types of stained glass in one panel without issue.

Glass fusing is a completely different process. Here, you stack pieces of glass and heat them in a kiln until they melt and fuse into a single, unified piece. This is where COE becomes the golden rule. If you mix glass with different COEs, they will expand and contract at different rates inside the kiln. This creates massive internal stress, which will almost certainly cause your project to crack or even shatter as it cools.

So, can you use fusible glass for a stained glass project? Absolutely. Artists often use beautiful COE90 or COE96 sheets for their color and texture in stained glass work. But using standard stained glass for a fusing project is a big risk. Since it hasn’t been tested for a consistent COE, you have no guarantee of compatibility. For predictable, successful results in the kiln, always stick with glass specifically made for fusing.

How to Choose the Right Fusible Glass

Walking into a glass shop or browsing online is like being a kid in a candy store. The colors, textures, and finishes are mesmerizing. But with so many options, how do you pick the right glass for your project? It comes down to a few key decisions. By thinking through the COE, color, thickness, and compatibility, you can confidently select glass that will bring your creative vision to life and ensure a beautiful, crack-free result when it comes out of the kiln. Let’s break down what you need to know.

Match Your COE

This is the single most important rule in glass fusing, so I’ll say it plainly: you cannot mix glass with different COEs in the same project. It’s very important not to mix COE90 glass and COE96 glass together. If you do, the piece will become internally stressed as it heats and cools, and it will almost certainly crack. Before you buy a single sheet, decide which COE system you want to work with. Many artists pick one and stick with it to build their collection, which prevents costly mix-ups. Always check the COE before adding a piece of glass to your cart or your project.

Choose Your Color and Finish

Now for the fun part: choosing your palette. Fusible glass is available in a breathtaking spectrum of colors, patterns, and finishes. This is where your artistry truly shines. Think about your design. Do you want light to shine through your piece? Go for transparent glass. Need a solid, opaque look? Opalescent glass is your best friend. You can also find specialty options like iridescent glass that shimmers with a rainbow sheen or dichroic glass that shifts colors depending on the angle. Don’t be afraid to mix and match different finishes (within the same COE, of course) to add depth and personality to your work.

Select the Right Thickness

Most fusible sheet glass comes in a standard thickness of about 3mm. For beginners, I recommend sticking to this standard size for the main components of your project. Using glass of a consistent thickness helps your piece heat and cool evenly in the kiln, which is crucial for a smooth, uniform finish. While you can certainly incorporate thinner elements like stringers or thicker components for dimensional work, your base layers should generally be the same thickness. As you get more experienced, you can play with varying thicknesses, but you’ll need to adjust your firing schedules accordingly.

Test for Compatibility

Even when you follow the golden rule and stick to one COE, slight variations can exist between different manufacturers or even different production runs from the same company. For this reason, it’s always best to buy your glass from a reputable supplier that guarantees compatibility. For a project you’ve poured your heart into, you can perform a small test by fusing scraps of your chosen glass together. This quick check ensures they melt together smoothly without creating any hidden stress. This simple step can save you from potential heartbreak and is a professional habit worth adopting early on.

Essential Tools for Glass Fusing

Once you’ve chosen your glass, gathering the right tools is your next step. While the list might seem long, having the proper equipment makes the glass fusing process safer, more efficient, and a lot more fun. Think of these as your partners in creativity. You don’t need the most expensive version of every tool to start, but investing in quality basics will pay off in your finished pieces. From the kiln that brings the heat to the cutters that shape your vision, each tool plays a vital role in transforming flat sheets of glass into a beautiful work of art.

Glass Fusing Kilns

Your kiln is the heart of your glass fusing studio. This is where the real transformation happens. Glass fusing kilns are specifically designed to reach the high temperatures needed to melt glass, usually between 1,400°F and 1,600°F. When you’re choosing one, think about the size of the projects you want to create. A smaller kiln is great for jewelry and coasters, while a larger one gives you room for plates, bowls, and bigger art pieces. Also, pay attention to the controller. A digital controller helps you program precise firing schedules, giving you consistent and reliable results every time you fire. It takes the guesswork out of the process so you can focus on your creativity.

Slumping and Draping Molds

If you want to create three-dimensional pieces, you’ll need molds. Slumping and draping are two techniques used to shape glass with heat. For slumping, you place glass inside a mold to form a shape, like a bowl or a plate. Draping involves laying a sheet of glass over a mold, letting it sag and fold into a more organic form as it heats. These molds are typically made from ceramic or stainless steel and come in a huge variety of shapes and sizes, from simple squares to intricate floral designs. They are a fantastic way to add depth and function to your fused glass art, turning flat panels into functional and sculptural objects.

Cutting Tools and Safety Gear

Before you can fuse glass, you have to cut it. A few essential cutting tools will help you get clean, precise cuts for your designs. You’ll want a good glass cutter for scoring the glass, running pliers to break the glass along the score line, and breaking-grozing pliers for nipping off smaller pieces. Just as important as your creative tools is your safety gear. Always wear safety goggles to protect your eyes from tiny glass shards. A pair of sturdy gloves will keep your hands safe, and a dust mask is crucial for preventing the inhalation of glass dust while you work. Safety first, always.

Your First Fusing Project: A Step-by-Step Guide

Ready to melt some glass? This guide will walk you through the entire process, from a creative spark to a finished piece. We’ll cover the essential steps to ensure your first project is a success. Remember, glass fusing is a process of patience and precision, but the results are always worth it. Let’s get started.

Step 1: Plan Your Design

The best part about glass fusing is that you work with the glass when it’s cold, so you have plenty of time to perfect your design. Before you even touch a piece of glass, sketch out your idea on paper. Think about the colors, shapes, and layers you want to use. For your first project, simple is often better. A small suncatcher, a set of coasters, or a decorative tile are all great starting points. If you’re not quite ready to cut your own shapes, you can always use precut glass shapes to make assembly a breeze. Planning ahead helps you visualize the final product and ensures you have all the right materials on hand.

Step 2: Clean Your Glass

This step might seem minor, but it’s one of the most important for a flawless finish. Any dust, fingerprints, or oils left on the glass can cause unwanted bubbles or hazy spots called devitrification during firing. Before you start cutting or assembling, clean every piece of glass thoroughly. You can use a lint-free cloth with a 50/50 mixture of isopropyl alcohol and distilled water, or simply wash the glass with warm, soapy water and dry it completely. Make sure your glass is bone-dry before it goes into the kiln. A clean start is the secret to a professional-looking piece you can be proud of.

Step 3: Cut and Shape Your Glass

Now it’s time to bring your design to life. Using a quality glass cutter, score the glass along your desired lines. Apply firm, even pressure, but you don’t need to press too hard; you just want to create a clean score line. Then, use running pliers to snap the glass apart. Always wear safety glasses during this step to protect your eyes from any stray shards. If your design has intricate curves, a pistol grip cutter can offer more control. Remember to work on a flat, clean surface. If cutting feels intimidating, start with COE90 or COE96 precut shapes to get a feel for how glass layers together.

Step 4: Layer Your Piece

This is where your artistic vision really comes together. Start with a solid base piece of glass and begin arranging your cut shapes on top according to your design. You can stack layers to create depth and new color combinations. To keep smaller pieces from shifting as you move your project to the kiln, you can use a tiny bit of fusing glue. Apply it sparingly with a toothpick, as too much glue can leave a residue after firing. Think of it as a temporary tack to hold everything in place. Take your time and enjoy the process of building your composition.

Step 5: Prep and Load the Kiln

Before you fire, you need to prepare your kiln shelf. This is a critical step to prevent your beautiful creation from permanently fusing to the shelf. You can either apply a few coats of kiln wash or, for an easier option, use a piece of kiln shelf paper cut to size. Place the paper on the shelf and set your assembled glass project in the center. Carefully transfer the shelf into your kiln, making sure not to bump or shift your design. Double-check that your project isn’t too close to the kiln walls or thermocouple.

Step 6: Fire, Anneal, and Finish

With your project loaded, it’s time for the magic to happen. Program your kiln using a firing schedule appropriate for the type of glass and the desired effect (tack, contour, or full fuse). Once the firing cycle is complete, the kiln will begin the slow cooling process, known as annealing. This step is vital for strengthening the glass and preventing cracks. Resist the temptation to peek! Wait until the kiln is completely cool to the touch before opening it. Once you remove your piece, check for any sharp edges and smooth them down with a grinder if needed.

Glass Fusing Safety 101

Working with glass is an incredibly rewarding process, but let’s talk about something just as important as your design: safety. Creating a safe workspace isn’t about limiting your creativity; it’s about giving you the confidence to experiment freely. By making a few simple practices part of your routine, you can protect yourself and your studio, letting you focus on bringing your beautiful glass art to life. Think of it as setting the stage for success before you even make your first cut.

Essential Protective Gear

First things first, let’s gear up. Protecting yourself is simple and non-negotiable. Always wear safety glasses. When you cut or break glass, tiny, sharp shards can fly, and your eyes are too precious to risk. Next, get a good pair of heat-resistant gloves for handling pieces coming out of a hot kiln. For tasks that create dust, like cutting or grinding, a dust mask is a must to prevent you from inhaling fine glass particles. The Glass Art Association of Canada also recommends wearing protective gear to guard against common cuts and injuries. It’s a small habit that makes a huge difference in keeping you safe while you work.

Kiln Safety and Proper Ventilation

Your kiln is the heart of your studio, and it deserves your full attention. Make sure your kiln is placed on a non-combustible surface, like a concrete floor or a proper kiln stand, with plenty of clear space around it. Keep it far away from any flammable materials. Ventilation is just as critical. Firing glass can release fumes from binders and other materials, so your workspace needs good airflow. A dedicated kiln vent system is ideal, but at a minimum, work in a well-ventilated room with open windows. As the American Craft Council advises, proper ventilation is essential to prevent the buildup of potentially harmful fumes, so never fire your kiln in a small, enclosed space.

How to Handle and Store Glass Safely

The way you handle and store your glass can prevent a lot of headaches and accidents. When carrying a sheet of glass, use both hands and hold it vertically, keeping it close to your body for better control. For storage, invest in a sturdy rack to keep your fusible glass sheets upright and separated by padded dividers. This not only prevents breakage but also makes it easier to see your inventory. If a piece does break, clean it up immediately with a dedicated broom and dustpan. Many artists on glass fusing forums suggest disposing of sharp scraps in a clearly labeled, puncture-proof container to keep everyone safe.

Common Beginner Mistakes to Avoid

Every artist makes mistakes; it’s a natural part of the creative journey. But in glass fusing, some missteps can be costly in both time and materials. The good news is that many of the most common beginner errors are completely avoidable once you know what to look for. By paying attention to a few key details, you can save yourself a lot of frustration and create beautiful, successful pieces right from the start. Let’s walk through some of the typical pitfalls and how you can sidestep them.

Forgetting to Clean Your Glass

This might be the most overlooked step, but it’s one of the most important. The oils from your fingers, dust, and any marker lines can burn into the surface during firing, leaving a permanent, hazy blemish called devitrification. Before you assemble your project, give every piece of glass a thorough wipe-down. You can use a dedicated glass cleaner or a simple solution of isopropyl alcohol and water. Be sure to use a lint-free cloth to avoid trading dust for lint. Taking just a few minutes to clean your glass ensures your final piece comes out of the kiln sparkling and clear, just as you envisioned.

Ignoring Your Firing Schedule

It’s tempting to want to speed things up, but a proper firing schedule is your roadmap to a successful fuse. This isn’t just about melting glass; it’s a precise science. Your schedule controls how fast the kiln heats up, how long it holds the glass at fusing temperature, and, most critically, how slowly it cools down. This slow cooling phase, called annealing, allows the glass to stabilize and relieves internal stress. If you cool it too quickly, you risk thermal shock, which can cause your beautiful piece to crack or even shatter. Every kiln is different, and your schedule will change based on the size and thickness of your project, so always follow a tested schedule.

Mixing Incompatible Glass

This is the golden rule of glass fusing: never mix glass with different Coefficients of Expansion (COE). Glass with different COEs, like COE90 and COE96, expands and contracts at different rates when heated and cooled. Even a tiny scrap of the wrong COE in your project will create immense internal stress as the piece cools. This will cause your project to crack, and it might not happen right away; it could be hours or even days later. To avoid this heartbreak, keep your glass types completely separate in your studio. Label your storage bins and scrap containers clearly. It’s a simple organizational habit that will save your work.

Starting Without a Plan

The excitement of working with beautiful glass can make you want to jump right in, but a little planning goes a long way. Before you even make a cut, have a clear design in mind. Sketch it out on paper. This helps you figure out your layers and what colors you’ll need before you start. A plan also applies to your learning process. While it’s possible to teach yourself, taking a class can provide a solid foundation and prevent costly errors. Starting with a simple project using molds to create a small dish or jewelry is a great way to learn the fundamentals and build your confidence before tackling more complex designs.

Where to Buy Fusible Glass

Once you have a project in mind and know which COE you need, it’s time for the fun part: shopping for glass. Finding a reliable supplier is key to keeping your creative momentum going. You can find fusible glass both online and in local specialty shops, and each has its own perks depending on what you’re looking for.

ArtGlassSupplies.com

For a huge selection you can browse from your studio, ArtGlassSupplies.com is a fantastic resource for glass artists. As a specialized online retailer, it offers a massive inventory of both COE90 and COE96 glass, so you can always find compatible sheets for your project. Beyond the basics, you can explore specialty options like dichroic glass, frit, and stringers to add unique flair to your work. Since the site caters to glass artists of all kinds, you can also stock up on other essentials like molds and even new kilns. It’s a convenient way to get everything you need delivered right to your door.

Local Art Glass Stores

Sometimes, you just need to see the glass in person. The way a sheet of iridescent glass catches the light is something a photo can’t always capture. Visiting a local art glass store allows you to hand-pick your sheets and get a true feel for their color and texture. These shops are often community hubs, staffed by fellow artists who can offer advice and help you find the perfect piece for your vision. Many local stores also offer classes, tools, and other resources to support your craft. A quick online search for “glass art supplies near me” can help you find a store in your area where you can get inspired and talk shop with other enthusiasts.

Related Articles

• What Does COE Mean in Glass? A Fuser’s Guide
• A Complete Guide on, How to Prepare for Glass Fusing?
• The Complete Guide to COE 90 Fusing Glass Supplies
• What Is COE 96 Fusing Glass? A Beginner’s Guide
• COE Glass Meaning: A Beginner’s Guide to Fusing

Frequently Asked Questions

Is it really that bad to mix COE90 and COE96 glass? Yes, it’s a dealbreaker. Think of it as trying to use two ingredients that have a chemical reaction. When you heat glass with different COEs, they expand at different speeds, and when they cool, they shrink at different speeds. This creates an incredible amount of stress inside the glass. Your project will almost certainly crack, and it might not happen until hours or even days after it has cooled. It’s a heartbreaking result that is completely avoidable by keeping your glass types separate.

Can I use my old stained glass scraps for a fusing project? I would strongly advise against it. While some stained glass might be fusible, most of it is not tested for a consistent COE. Using it in a kiln is a gamble because you have no idea how it will expand and contract. You might get lucky once, but you could also end up with a cracked piece and no way of knowing which scrap caused the problem. For reliable, beautiful results, it’s always best to stick with glass that is specifically labeled as fusible with a clear COE.

Do I need my own kiln to start fusing glass? A kiln is essential for the actual melting process, but you don’t necessarily have to buy one right away. Many local glass studios or community art centers offer kiln space for rent. This is a fantastic way to try out glass fusing and see if you enjoy it without making a big investment. Taking a beginner’s workshop is another great option, as the cost of materials and kiln time is usually included.

What happens if I don’t clean my glass perfectly? Any fingerprints, dust, or oils left on the glass can cause a permanent blemish called devitrification. It looks like a hazy or scummy film on the surface of your finished piece, and it can’t be polished off. Taking a few minutes to wipe down your glass with a lint-free cloth and a simple alcohol-water solution is one of the easiest ways to ensure your final project comes out of the kiln looking clear, vibrant, and professional.

What’s the difference between a ‘full fuse’ and ‘slumping’? These are two different steps in creating a three-dimensional object. A ‘full fuse’ is a high-temperature firing where you melt two or more layers of glass together until they become a single, smooth, flat piece. ‘Slumping’ is a separate, lower-temperature firing. After you have your fused piece, you place it on top of a mold and fire it again just until it softens and ‘slumps’ down into the shape of the mold, creating something like a bowl or a plate.