Re: Gel Nails in Olten
Can't help directly on this myself.
So this is how you go about it:
Go to town, check out some bars, cafes, restaurants for female workers until you find one with nice nails (should be fairly easy). Sit down, buy a drink and casually ask about their nails. I'm very confident you will get the information you seek in less then 10 minutes (checking cafes included).
Kirchgasse and/or Altstadt would be the place to go for this endeavour.