They don’t soak the shellac long enough and then they scrape it off, damaging the nail bed. I said this to the lady doing my nails and she said she had to scrape it because I had OPI shellac and not the shellac their salon used. I don’t see why that makes a difference and I asked her to please let my nails soak longer. The manicure area is in the underground part so it doesn’t seem well ventilated and you are just breathing the fumes!