ᐅ Darkening of KALLAX units – is it possible to prevent this?

Created on: 6 Jun 2022 08:17
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Fardu
Hello everyone,

A few months ago, I bought a KALLAX shelving unit from IKEA, and I’ve recently noticed that the originally light oak veneer is gradually darkening. I understand that wood and veneered surfaces can naturally age when exposed to daylight, but this effect bothers me because the furniture no longer looks as fresh as it did at the beginning.

My question to the community: Are there any ways to prevent or at least significantly slow down the darkening of the KALLAX shelving unit?

I’m especially interested in whether some kind of sealing, varnishing, or special UV protection could help without altering the appearance too much. If anyone has practical experience or specific recommendations, I would be very grateful for detailed advice.
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Surela
6 Jun 2022 15:32
I would like to go into more detail here:

The darkening of wood veneers, such as those used in KALLAX, is mainly caused by UV radiation in daylight, which breaks down the lignin in the wood and leads to color changes. Veneers are more susceptible than solid wood due to their thin wood layer.

Sealing with a clear varnish that absorbs UV is therefore the best method to slow down the darkening process. It is particularly important that the varnish is applied transparently and as thinly as possible to preserve the natural appearance.

Alternatively, there are special wood oils with UV filters that protect the wood but are somewhat less resistant to mechanical abrasion. Maintenance also plays a role here: the surface should be regularly cleaned and cared for, as dirt changes light reflection.

A small note: matte finishes show less gloss and are often perceived as more pleasant visually. If you prefer high gloss, special polyurethane (PU) varnishes are recommended, but these can visually alter the veneer.

Where is your shelf positioned? Directly by the window? This significantly affects the degree of fading.
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Fardu
6 Jun 2022 16:10
Surela schrieb:
What is the position of the shelf in your setup? Right next to the window?

Yes, unfortunately, the KALLAX is placed close to the window on the south side. I have noticed that the exposed areas there darken the most, especially during strong midday sunlight. So sealing it would actually make sense, but I don’t want to deal with chemical odors for weeks. Could I also combine this with a UV protection film on the window?
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tarju41
6 Jun 2022 16:54
I have had good experiences with UV protection films on windows; they significantly slow down aging.

If you go for a combination like that – film and a light clear coat – you’re on the right track.
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kloreo
6 Jun 2022 17:23
Window film is useful if you don’t want to install on the furniture. Clear varnish usually prevents odors if it is well ventilated.
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Genevieve
6 Jun 2022 18:06
kloreo schrieb:
Clear varnish usually prevents odors if it is well ventilated.

That is relative. Many clear varnishes do emit odors for a longer time.

Fardu, if you are concerned about odors, pay attention to water-based varnishes. They smell much less and dry faster. It is also worth asking the manufacturer about VOC levels in advance.
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Alberto51
6 Jun 2022 20:42
Hi Fardu, I completely understand how annoying the darkening over time can be. I experienced something similar with a shelf, and it felt like the furniture was getting 'older' and somewhat 'worn out' as time passed.

What helped me was using a wood oil with UV protection and reducing direct sunlight with curtains. Now the shelf doesn’t seem to darken anymore. It takes a bit of effort, but the feeling of protecting your furniture is definitely worth it! 🙂

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