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I used this, first ,when I bleached my hair. The paper stays firm on the hair and you can easily check the process. Then I used it with color (balayage) and the sheets did not adhere to the hair as much, and a lot of them fell.
Removing the product and drying the sheets can be tedious and time consuming.
Im not a professional so I used them for personal use. I guess if you are a professional hairstylist, it can save you a lot of money, and is environmental friendly; taking into consideration that you will use this on a daily basis.
For personal use I would prefer working with regular foils.