Frequently asked questions:

If you can’t find the answer to your questions below please Contact Us.

Q. Can I buy glass from your website?

A. Yes, we have happy customers throughout Ireland who order from us on a regular basis. We stock a vast range of art glass including Bullseye glass, dichroic glass, kilns, tools and accessories. Orders are taken via our UK website. Click on ‘Shop Now’ to start browsing our shop.

Q. Can I pay in euros on your website?

A. You can choose € EUR from the top right hand corner and prices will display in Euros, payment will be taken in £ GBP according to the day’s exchange rate.

Q. How long does it take for orders to get to Ireland?

A. Orders up to 2kgs are made by Royal Mail and have a 5–7 day delivery time. Orders over 2kg will normally be delivered within 3-5 working days by courier.

Q. What if I change my mind about an order?

A. For your complete peace of mind, we offer a robust, no quibble returns policy.  If you change your mind, for any reason, simply return the item to us within 14 days of receipt for a full refund.

Q. Do you have a shop in Ireland?

A. Not yet! We deliver to Ireland from our main warehouse in Bristol UK, deliveries usually only take a couple of days and our delivery rates are very reasonable.

Q. What are your opening times?

A. The Warm Glass website is available at all times. Our offices are open Monday to Friday from 08.30 to 16.30 UK time.

Q. Can I place an order online and then collect it in person from Warm Glass UK?

A.  Yes, if you are coming on a class or visiting the UK, you are welcome to pick up your order in person, just select ‘Click and Collect’ as the delivery method at checkout.  This is a free service. Click here for directions and opening hours.

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Frequently asked questions:

Below are the most common questions we get asked about glass fusing. You can also browse our extensive Knowledge Base for free advice and tips or Contact Us for help.

Q. My Bullseye glass sheet has a wavy edge. Is this normal?

A. Due to the handmade nature of Bullseye Glass, your sheet may have a wavy edge. If you purchase a 25cm x 20cm sheet with a wavy edge, you will be able to cut a minimum rectangle of 25cm x 20cm from it.

Q. How do I know what temperature to fire my glass to?

A. Click here to take a look at some basic glass firing schedules.  If you are still unsure, please contact us, we will be happy to help.

Q. My firing hasn’t turned out how I want it to. Can you give me some advice?

A. There is lots of information in our Knowledge Base.  If you can’t find what you need, please Contact Us, we are always very happy to help.

Q. My glass piece had a really huge bubble in it after firing. What went wrong?

A. There are several reasons why this may have happened. Bubbles in designs which use a single 3mm base with frit on top are very common and difficult to resolve without using fibre on the shelf to allow the air to track out. Some bubbles are not between layers but come all the way through the glass and sometimes appear as a large hole in the glass. Large bubbles or holes in a piece are usually down to one of three things:

1. The main culprit is fusing thin glass too fast causing an 'apple pie' effect. This is where the glass seals around the edge, trapping air in the middle which then forms a bubble which turns into a hole when it pops. Use the super bubble squeeze firing schedule or use 2 layers of 3mm for the base.

2. A shelf which has been primed or has not been fired for a long time often holds moisture even though it looks dry, this moisture can turn to steam during the firing which can blow bubbles in your glass. If you get these large bubbles in a 6mm thick piece, the solution is to dry your kiln-shelf by firing it to 260C for 20 minutes with the kiln fully vented.

3. A dip in the kiln shelf can cause bubbles in your glass; if you put a straight edge across your shelf you should not see any gaps, try this on both sides of the shelf and fire on the flattest side. Ensure that your kiln shelf has no dips in it or just flip it and use the other side.

For further information take a look at our Knowledge Base Technical Support and Troubleshooting sections.

Q. Why has my glass cracked during firing?

A. There are 3 reasons for glass cracking.

1.Incompatible glass – This will only happen if you use glass from different manufacturers and is identified by the crack running around a piece of glass in the design. We only stock CoE90 Bullseye compatible glass, so you can be sure that all glass bought from us, including the dichroic glass, is inter-compatible.

2. Thermal shock – This is due to heating the glass too fast or cooling it too fast. Soft edges in the break means heating too fast and sharp edges on the break means cooling too fast.

3. Poor Annealing – Annealing time for glass should be calculated according to thickness (about 1hr for 6mm). If your design has different thicknesses the annealing hold should be doubled.

For our recommended firing schedules, see our Kiln Schedules page.

For further information take a look at our Knowledge Base Technical Support and Troubleshooting section.

Q. How do I avoid devitrification?

A. Devitrification or devit is a scummy white haze on the surface of glass after firing.  It is usually caused by contamination such as finger prints, sticker residue, grinding marks and dust. To avoid devit, clean the glass using glass cleaner and paper towel, protect the glass from dust before firing and use our basic full fuse firing schedules. If you still get devit after following these steps, try firing onto Bullseye Shelf Primer rather than thinfire (this is essential if you have been grinding the glass).

If devitrification does occur, you can use clear powder to remove it. Take a look at this Tipsheet for more information: How to Fix Surface Flaws.

Q. When I fired my glass in a slumping mould, it pulled in at the edges and became distorted. What went wrong?

A. It is important to use the correct firing schedule for the mould in question to avoid problems like distorted edges, bubbles or the glass sliding to the base of the mould. Moulds vary greatly and there is no 'one size fits all' schedule. We publish a suitable firing schedule on the product page of each of our moulds (for use with Bullseye Glass). Don't forget to prime your mould with a shelf primer to avoid the glass sticking to the mould. We recommend Bullseye Shelf Primer for simple moulds, and Primo Primer for intricate moulds such as casting moulds. See our video on choosing primers for more information.

Q. When I use frit in between layers of glass I get problems with trapped bubbles. How can I avoid this?

A.  When using frit it’s always a good idea to run your frit design right to the edge of the glass, this will allow air to track out of the design instead of getting trapped and causing bubbles.

Contact Us:

We go to great lengths to ensure that we provide first class customer service and offer all our customers UNLIMITED CUSTOMER SUPPORT.  Feel free to contact us anytime and as often as you like – even with those questions that you might feel are the silliest! We all work with glass, so please just ask, we really are here to help. Use our enquiry form and we will get back to you within one working day. You can also take a look at our Knowledge Base for a wealth of free information on glass-working.

Alternatively you can contact us via our Facebook page, where we regularly post glass-working tips and information about sales, competitions and events.

Frequently asked questions:

Q. How do I pay for my order with Warm Glass?

A. The quickest and easiest way to pay for your order is by debit or credit card, or via PayPal.  Other payment options available at the checkout are bank transfer and cheque. We cannot dispatch goods until cleared funds are received, and some bank charges may apply to transfers from non-UK accounts.  If you are a school and have an Education Account with us you can enter a Purchase Order number at checkout.

Q. How do I qualify for a discount on my orders?

A. We have a transparent loyalty discount scheme based on the amount you have spent with us, we also have special discounts for schools, colleges and students.  Click here for more information. 

Q. Do you supply wholesale glass products to the trade?

A. We provide Wholesale Multibuy Discounts on certain products, just look for the multibuy icon on the website or see our MultiBuy Wholesale Discount page for more details.

Q.  What happens if I am not at home when my order arrives?

A.  In most circumstances a card will be left if you are not in.  The driver may leave the parcel with a neighbour or take it to the depot to attempt re-delivery the following day.  Crates and certain kilns are sent by special courier and the driver will ring you prior to delivery. If you are not in, then a card will be left and the item kept at the depot to attempt redelivery. For more information on delivery, click here.

Q. Do I have to pay VAT on my orders?

A. Yes, within Europe VAT has to be paid either in the UK or in your own country. UK VAT is 20% but you can opt to pay VAT in your own country if a company VAT number and trading address is supplied to us in advance of your order (we can then adjust your account so that prices will show excluding VAT as you shop).

Q. How can I subscribe to receive Warm Glass emails about upcoming promotions?

A. Subscribing to our email list is the best way to hear about our promotions, discounts and new products, and we promise not to clog up your inbox!  Just click here to register.

Q. What happens if my order arrives broken?

A. If you have breakages please Contact Us and we will arrange for a replacement or a refund. 

Q. How do I return an unwanted item?

A.  Please contact our Customer Services team and we will be pleased to assist you.  Please take a look at our Returns Policy for more information.

Q. I am having trouble logging in.

A. We recommend logging in as soon as you enter our site. This way you can see any personalised discounts or VAT rates you qualify for.  Click on the Log in/Register button at the very top of the page and follow the instructions.  If you need any help please Contact Us.

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Frequently asked questions:

We take care to securely pack all our deliveries and offer fast and reliable delivery to Ireland.

Q. How much will delivery to Ireland cost?

A. We have low cost delivery rates for Ireland which are automatically calculated at the checkout. For full information on delivery costs, click here. Charges can be displayed in Euros and may fluctuate due to the € to £ exchange rate.

Q. How long will it take for my order to get to me?

A. Orders up to 2kgs are made by Royal Mail and have a 5–7 day delivery time. Orders over 2kg will normally be delivered within 3-5 working days by courier.

Q. Can I track my order?

A. Orders under 2kg will be sent by Royal Mail and cannot be tracked. Orders above 2kg will be sent by a courier which can be tracked and will require a signature. If you provide your mobile phone number at checkout then we can text you with the tracking information.

Q. What happens if my order arrives broken?

A. If you have breakages please Contact Us and we will arrange for a replacement or a refund. 

Q. How do I return an unwanted item?

A.  Please contact our Customer Services team and we will be pleased to assist you.  Please take a look at our Returns Policy for more information.

Contact Us:

Frequently asked questions:

At Warm Glass we're passionate about education and enabling creative people to get the best out of the glass resources we offer. Here in the UK we supply over 450 schools and colleges with glass materials for artwork, including the Royal College of Art.

Glass is becoming used as an expressive medium in many art establishments and is no longer restricted to dedicated glass programmes. If you are interested in seeing what we can do for your school, please Contact Us or visit our Glass for Schools page.

Q. Are you able to give on-line support to schools and colleges teaching glass?

A. We have a personalised login area to the Bullseye Glass online education resource which includes video tutorials and factsheets. For further details please Contact Us.

Q. I am a student, how do I register for a student account?

A. If you are on a recognised glass course of 12 weeks or longer you can qualify for a Student Account giving you a 10% discount off standard prices (some exceptions apply).  Please apply here. We will need to know the name of the course, college and tutor.

Q. I have booked onto a Warm Glass course. What should I wear and do I need to bring anything?

A. We will email you before the course with details and any special requirements (such as bringing in images).  We provide all tools and glass, as well as lunch.  Please wear comfortable clothing and closed toed shoes.

Q. I have booked onto a Warm Glass course. Can you recommend any local places to stay?

A. Please click here and take a look at the ‘Places to stay and eat’ pdf.

Q. I am coming to the UK but all your classes are booked, do you offer private tuition?

A. If you are coming to the UK but there is no class available on your visit dates, you may still be able to book a Personalised Tuition Day with us. Take a look at our Courses section for more information.

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