there is a filler available that is used to fill up holes in wooden floor boards. It is a transparant fluid (smells strongly / volitile). It needs to be mixed with sanding dust (saw dust is too coarse) and can be applied. The surface is slightly sanded afterwards. When using the same sanding dust as the original wood, the difference is hard to spot.
For smaller cracks i use superglue with our without sanding dust. Look for the fluid version that will soak in deeply and sand afterwards.
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