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My casting cracked. How can I fix it?

That depends entirely on the piece and the crack. Some cracks can be fixed relatively easily while for others it might not be worth it. If it's a large crack or one that's is in the interior of the piece you'll probably need to recast. read more

My casting cracked. Can I put it back in the mold and refire?

Theoretically in certain cases it is possible to reinvest the cracked piece and recast it.  But if the mold was damaged while removing the cracked piece you will need to make a new mold. And while a damaged piece can be repaired the amount read more

How large can my casting be?

Your casting can be as large as your kiln will allow. As a rule of thumb the interior of the kiln should be at least twice the height of the final casting or more depending on your setup. For large castings one of the most important read more

How do I prevent sharp edges in castings?

Often sharp edges are a result of the glass scraping down the side of the mold during firing. To minimize sharp spots set up your glass and mold up so that as the glass softens it flows out to meet the walls of the mold rather than read more

How do I make pâte de verre?

Pâte de verre is a kilncasting method that literally means "paste of glass".  The general premise is to mix frit granules with some sort of binder such as gum arabic then apply the glass to the inner surface of a negative mold. Pâte read more

How do I coldwork my kilncast piece?

What kind of piece is it and what are you trying to accomplish in coldworking it If the piece includes a reservoir that needs to be removed this can be taken off with a wet tile saw with a diamond blade or it can be ground off read more

How can I cast to get some gloss on the finished surface?

The interior texture of the mold will affect the final texture and amount of gloss on your piece. Using an investment mix or mold material with a fine grain will reduce the amount of texture and increase the degree of gloss. There are read more

Do I have to dry my casting mold in the kiln?

Yes it is important to remove as much moisture as possible from your casting mold. To learn more read the "Firing the Mold and Glass" section in TipSheet 8 Lost Wax Kilncasting. Related Questions How can I get some gloss on the finished read more

Do glass colors change in kilncasting?

Color can change depending on a variety of factors.  (For example the thickness of the glass and the amount of time spent at casting temperatures).  Some Bullseye glasses mainly the 001100 series and 001400 series are so saturated read more

Can I make a reusable kilncasting mold?

Yes if you use the appropriate investment mix. The commercially available product Castalot is one example of a good reusable mix for glass slumping fusing or kilncasting. Note Castalot will not work if your model has undercuts. Related read more

ZYP Tips

Download the ZYP Tips for Ceramic Casting Molds PDF ZYP Boron Nitride Aerosol Lubricoat (8714) is a separator that can be applied to ceramic casting molds as a release between the mold and glass. It can be very effective and…

Bullseye Investment Mixing Instructions

Download the Bullseye Investment Mixing Instructions PDF Safety First Mix in a well-ventilated area while wearing a NIOSH-approved respirator. Mixing Steps Determine how much investment material you will need for your…

Bubble Population

Download the Bubble Population PDF Why Does My Transparent Glass Seem to Turn White' Bubbles affect light transmission in transparent kiln-glass. As a result' the more bubbles your glass contains (i.e.' the higher its…

Bullseye Glass Color Conversion Chart

Bullseye Glass styles conveniently converted to CMYK and RGB color values to streamline your work flow and help you visualize your designs before you make a single cut. Download the Bullseye Glass Color Conversion Chart here (updated…

Murakami SP-9500 Diazo Sensitizer Mixing Instructions

Overview Murakami's premier dual cure graphic emulsion. Outstanding resolution of fine details. An easy to use emulsion with wide latitude and exceptional durability. For instructions' download our Diazo Mixing Instructions…

Pre-Firing Your New Kiln

Overview Before using a new kiln for glass projects' you will need to pre-fire it. This burns out binders' moisture' and other residue left over from the manufacturing process. Read and download the PDF file' Pre-Firing…

Mold Tips: Heart Casting Mold (8976)

More Information Mold Tips' Heart Casting Mold (8976) PDF Helpful Resources Frit tinting articleFrit tinting videoMold Tips' Suggested Slumping SchedulesTips for Using Bullseye Slumping Molds Featured Products Heart…

Working with Accu-Cast 880 Blue

Overview Accu-Cast 880 Blue is a type of alginate that is fairly easy to mix and sets in 5-10 minutes. It has a somewhat short working life and will dry out and shrink over a couple of days. However' if kept in a sealed…

Quick Tip: Kilncast and Slumped Bowl

Get experience in volume calculation' frit tinting' and more as you create a kilncast disc from a frit-and-powder mixture' coldwork the edges' and slump it into this graceful bowl. Prepare the Dam Cut a 1" strip of 1/16" Fiber…

Recommended Annealing Cycle for Bullseye Glass

Save time and energy. Anneal thick slabs at 900 degrees. As of June 2009' Bullseye has changed its chart for annealing thick slabs. Specifically' the recommended anneal soak temperature has been lowered from 960°F/516°C to…

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New to using Bullseye Glass?

 "Your choice of glass is probably the most important decision you will make as a kilnformer." -Artist Steve Immerman on why he exclusively uses Bullseye. Bullseye glass is developed by artists, for artists. We've got your…

Is it safe to fire Bullseye Glass in a kiln?

Yes. At cold temperatures and typical firing temperatures, the colorants are encapsulated in the glass and the glass does not emit odors or toxics into the air. However, ventilation is recommended to dissipate odors from shelf…

What is The Rule of Halves?

This rule is important to know for successful glass cutting. A score is more likely to run properly when there are equal amounts of glass on either side of it. This is particularly important for cutting strips of…

Where can I get answers to frequently asked customer service and sales questions?

For frequently asked customer service and/or sales questions, please visit the Customer Service/Sales FAQ section in our online store.  If you don't see the answer to your question there, please give our sales department a call…

How big are the individual granules of frit? If applying Bullseye frit with a sifter, what size mesh screen will I need?

Bullseye frit granules come in five sizes: extra large (available in clear only), coarse, medium, fine, and powder. We recommend applying frit with a sifter, as there are a number of interesting effects that can be…

What is Bullseye's glass coding system?

Every piece of Bullseye glass you buy is named with a precise code. The code provides information including color, texture, treatment, thickness and form or shape. Download the Bullseye Glass Coding System PDF FAQs Return to…

Is Bullseye glass COE 90?

Unfortunately, the answer to this question is not simple.  The intent of most glass fusers who ask this question is to find out if Bullseye glass is compatible with glass made by another manufacturer. But COE ("coeffecient of…

What are "striking" glass colors?

  Some Bullseye glasses appear pale or colorless in the cold sheet form, but “strike” or mature to a much different color when fired. Striking colors can vary, depending on temperature, atmosphere, and heat history. Producing…

Is Bullseye glass compatible in all conditions?

When kilnforming, there are a multitude of variables to keep in mind. If you plan to subject Bullseye glass to unusual working conditions, we always recommend conducting your own tests. Under normal working conditions, Bullseye…

What should I know about studio safety?

Here are are some general guidelines to avoid injury while working in the kiln-glass studio. For more information, see Safety in the Kiln-Glass Studio. When working in a kiln-glass studio, cuts will happen, but they are…

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