Why has my glass paint gone a funny colour after baking?

by Coral

I have recently painted some wine glasses using gloss enamels and also vitrea160. Before I baked them the colours were fine but afterwards the white had seemed to have gone yellowish and the silver liner went goldish. What have I done wrong?

Comments for Why has my glass paint gone a funny colour after baking?

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Nov 25, 2014
Colour changes with Glass Paint
by: Cheryl

Hello Coral,
What a lovely name!
Cheryl here from YDPR....

Have you calibrated your oven to ensure the temperature is accurate? If your oven runs hot or cool, even by just 5 degrees, it could affect the colour.

Check your oven temperature with an oven thermometer and then adjust your temperature accordingly. If the manufacturer says to cure the paint at 350F and when you set your oven to 350F but the thermometer says 355F, then set your oven to 345F.

That should solve the problem. Let us know how you make out!

Nov 26, 2014
Thank you. Also got another question :)
by: Coral

Thank you so much! I'd be lost without your advice. I have just ordered a thermometer so I will let you know the results!
Gloss enamels have a shorter baking time than vitrea so if I have used both paints on one product should I go with the shortest time? And if so, would the vitrea still set?

Many thanks!
Ps..... Not too fond of my name myself but thank you for the compliment :) x

Nov 26, 2014
Mixing Glass Paint Brands and Timing
by: Cheryl

Hi again Coral!
We're getting to be old friends! Love that! (And I do think you have a most lovely name, so there!)

On another note.....
It's not recommended that you use different manufacturers' glass paints for the same project. There's a whole whack of chemistry that goes into creating these different glass paints which is why one brand requires more or less curing time.

Having said that, I'd be inclined to do a test. Use White for the test. I would definitely not shorten the curing time of the Vitrea. But check and see how the Gloss Enamels perform when cured longer than called for, if they don't yellow you should be good to go. But do test them in the top rack of the dishwasher to make sure the extra curing time did not compromise the adhesion. You may be able to get away with it. That would be cool!

For me, I'm so health and safety concerned that I'd be wondering what kinds of interaction could these two types of paints be causing while they're curing...what am I breathing in? Perhaps I'm a little overly cautious.

So to be safe, make sure there's good ventilation and have fun!! Let me know how things go! :o)

Dec 01, 2014
Baking Glass Paint Before Full Curing Time
by: les

I have found that baking before the full cure time will result in yellowing of the white. I did not notice any difference in other colors.

Dec 01, 2014
Baking Glass Paint Before Full Curing Time
by: Cheryl

Hey Les,
Thanks. This is good to know. I appreciate you sharing this information.

Always follow the manufacturer's instructions. If you need to air cure your glass pieces for a certain number of days, do that.

May 07, 2017
How can I get a glass baking kiln?
by: Andrew

Can you please let me know where to get a good kiln for making stained glass? Thanks

Jan 21, 2018
by: Babs

I’m having the same problem with yellowing glass paint. I was wondering if it’s because I have a gas oven? I’m not sure how testing the temperature would work as the instructions say to put the glass in while the oven is hot and let the temperature rise over the curing time? I also have been using the vitrea

Jan 23, 2018
Yellowing white glass paint
by: Cheryl

Hi Babs,
Test your oven temperature on a day you're not baking your painted glass. Just test it to see if it's accurate. If not, then adjust your temperature setting up or down to meet the required temperature as indicated by the manufacturer.

You wrote: "the instructions say to put the glass in while the oven is hot"... this is not accurate. The glass pieces go into a cold oven.

Vitrea is baked at 325F AFTER the paint has cured for 24 hours.

If there any changes to these instructions you will get sub-par results.

Let me know how it goes.

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