How to repaint rough parquet after sanding?

On an existing parquet floor in a private apartment, an area of about 2 sqm is quite worn out due to an office chair (despite oiling and parquet rollers). When sliding fingers over it, the surface there is quite rough and uneven. I want to prevent the condition of the parquet at this spot from deteriorating further. I want to avoid a floor protection mat. Instead, I can imagine that the parquet at this spot could be finely sanded and then robustly stabilized or sealed with a kind of transparent clear varnish. Is that possible? Which clear varnish is suitable for this? If sanding is not necessary for this, even better. Thanks Tobias

Just my amateur opinion in advance: oil and varnish do not get along particularly well as far as I know. But if varnish, then certainly parquet varnish. It is not called that for nothing ;-)

Hello "tobwenz".
As "i_b_n_a_n" already correctly explained, oil/wax mixtures and clear varnish do not get along.
The oil acts as a separating film on any protective coating (except oil) to be applied.
But ultimately, even with a sealing (which is what you called "clear varnish"), you cannot reduce the mechanical forces exerted on the parquet wood by the chair castors.
How should this work purely physically, especially since a sealing has to be set flexibly by the manufacturer so that it can absorb the natural movements of the wood without damage, without flaking off?
For parquet surfaces, so-called protective mats under chair castors are recommended. Even then, if the castor type "W" (stands for soft according to DIN EN 12529) is used.
Rough spots on an oiled parquet surface can be easily removed with fine sandpaper, applied without much pressure and moved in a circular motion.
Then remove the fine dust, go over the spot with a slightly damp cloth (this causes the top exposed wood fibers to stand up), and after drying, carefully remove these raised fibers (which can be felt when lightly stroking with the fingertips) by sanding.
Oil the area again and then enjoy a beautiful parquet floor.
Some things simply cannot be achieved.
Here, as an example, a parquet floor on one side and chair castor stress (without any disadvantage) on the other side.
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Regards: KlaRa