Wooden surface sticky I build a wooden table and put stain on it. After some months I put lacquer on it, which is made for that kind of stain. After two, three weeks I realized that it doesn't really protect anything. When I slightly draw my nails across the surface you could clearly see scratches.
Therefore I used another lacquer I had left. This was for all kind: Cars, metal and also wood. Now it works, no scratches anymore but instead the surface is sticky. Not much but enough to recognize it after touching the table two, three times.

Has anyone an advice how to get rid of that? Thanks a lot in advance!
There can be so many factors, that are not described here, that can lead to your problem. Simple things like, where do you live, is it moist most of the time? There are so many things that could affect lacquer drying. Lacquer takes a long time to dry, how does it smell right now? If it still smells the solvent of the lacquer, then it's not dry. Try putting it on a closed small room with a decent powered dehumidifier, for a couple of days, and see what happens. And until then, don't touch it (finger prints, scratches), no smell it's the best indication that it's dry. Good luck.