Blacknail - Yes it is easiest to do it while wearing the piece. Then just rinse and shampoo out. But you may expect your bond to be weakened afterwards due to all the soaking and rinsing.

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Hersute - i recommend this for fairly straight hair only. Perming lotion will take out curls and waves first put there by a similar technique. So if you have curly or wavy hair, this method is not for you.