I made an investment the other day and bought Nail envy from OPI (it is quite expensive in Sweden), to help my nails get strong again, they have been breaking so much. I used Nail envy some years ago and liked the result so I will try it again.
I am doing it my own way though. Since I am changing nailpolish almost every day, I will use this as a basecoat. I can't have it on for a week and not change polish. I did the same way last time.