ᐅ Kallax surface is getting blotchy due to sunlight – any tips?

Hello everyone,

I have an issue with my Ikea Kallax shelf. After some time in the sun, spots appear on the surface that look like discoloration and are sometimes dull. The shelf is placed directly by the window and receives regular sunlight, especially around midday. I suspect that the UV rays or heat are affecting the surface. It’s important to me to prevent this since it not only looks unattractive but I also worry that the stability or material might be compromised.

Does anyone here know this problem or have tips on how to best protect the Kallax surface from these spots? Maybe there are special care products, sealants, or other preventive measures? I’m looking forward to your experiences and suggestions, thank you!

Hello miles41,

I understand your problem; my Kallax shelves have also developed marks from sunlight, which are really annoying and don’t look good. I experimented a bit and found that the marks likely come from fading or heat damage. Unfortunately, there is no official solution from Ikea.

I tried to reduce the problem with furniture polish myself, but it only helped temporarily. The best approach I found is simply not to expose the shelves directly to sunlight or at least create some shade using an opaque film.

I can understand how frustrating this can be, and I’m hoping more practical tips will be shared here!

Hello,

First, a brief explanation: The surface of Kallax shelves typically consists of coated chipboard with a melamine resin finish. While this is relatively durable, it can fade over time and initially develop matte spots when exposed directly to UV light and heat.

The issue arises from a combination of UV radiation, temperature, and possibly moisture. The surface discolors because the paint or coating changes or becomes partially damaged.

My recommendations:

1. Positioning: If possible, place the shelves so they are not exposed to direct sunlight for extended periods.

2. Apply UV protective films on windows to filter out harmful UV light.

3. For existing spots, some people have tried special furniture care products or very fine sanding pads (use with extreme caution), but be aware this can easily damage the protective layer.

4. Alternatively, apply a thin, clear protective film that is UV-resistant.

5. If acceptable, a clear acrylic-based lacquer or furniture sealer can be applied in a thin layer – this might help but only protects effectively if applied properly.

I would be interested to know whether the damage is widespread or localized. Knowing the exact location also helps to better assess the duration and intensity of exposure.

What have you tried so far?

Parbo schrieb:
I would like to know whether the damage is more widespread or localized. Also, the exact location helps to better assess how long and intense the exposure to sunlight is.

Hello Parbo, thank you for the detailed reply. The spots are not widespread but rather scattered individually across the front surface of the shelves. The area is a southwest-facing window where the sun shines directly in for about 3-4 hours starting around midday. The shelf is placed almost directly against the glass, without any gap.

So far, I haven’t tried any cleaning products or protective films; I wanted to first check here in the forum whether that would be advisable or if it might cause further damage.

Clear coat or sealant sounds interesting but also a bit delicate. How labor-intensive is such a treatment usually, and how does it affect the appearance?

Using clear varnish (polyurethane-based or acrylic) on Kallax shelves is a possible solution, but only on a clean, dust-free, and slightly roughened surface. The surface must be sanded beforehand (with very fine sandpaper, e.g., 400 grit) to ensure proper adhesion. Afterwards, apply in thin layers and allow each layer to dry thoroughly between applications.

Caution: Uneven application can cause visible streaks and alter the surface appearance.

Under direct sunlight, UV-resistant clear varnish significantly reduces further damage to the surface. For your situation, this would be a long-term protective measure.

Alternatively, as already mentioned, a UV-protective window film is the simplest and safest way to protect the shelves. Combining both measures provides optimal protection.

Important: Avoid aggressive cleaners, as they can degrade the protective layer and promote fading.

miles41 schrieb:
How complex is this kind of treatment usually, and what about the appearance?

From my experience, it typically requires at least 2-3 thin layers of clear varnish applied on the surface, with thorough intermediate sanding. Visually, the surface often becomes slightly glossier and the color changes minimally – in some cases, it appears a bit warmer. So it’s not exactly 100% like the original, but I personally see that as a small compromise for the protection.

If you are not very confident with DIY skills, uneven results can of course happen. There are also clear spray varnishes that are easier to apply, but controlling the layer thickness then becomes more difficult.