Hi!
I totally agree! You never wet sand wood...And I would say ...you never wet sand a model built of wood, even if it is covered in thin glassfiber.
The best way is to dry sand and then use thin glassfiber and epoxy (or polyester resin) and use automotive 2 part laquer and spray paint the airplane.

Then, when everything is finnished...and if you want a mirror finnish...then you wet sand the whole airplane with 2000 paper...yes you sand it! And then polish it with automotive polishing compund like "3M finess it" nr 1-2 and 3. Then you have a mirror like finnish ,better than a new car.