Stupidity has just rewards, that woman is not hurting for money and should have been better educated than to be so stupid to use any type of substance that is not dissolved in water.
Having said that, due to having a beautician for a sig. true African nappy hair is a curse to their race.
If that hair is all hers, it takes a long time and a lot of money to keep it as she has and cutting it off would a looong term screw up.
My sig. will not work on African hair because while she could make more money if she did, you will spend a lot of hours just working on one person and depending on what they want it would be the equivalent of untying tiny knots for hours on end.
It would pay more money pers customer but far fewer customers per week.
You also have take extra classes, i.e. more $$$$$, to learn how to do it well.