Just co-signing on Sabino...people will write how they are concerned about using high heat on their hair, but I can say with absolute honesty that when I used Sabino during a six month relaxer stretch last year before I BC, I used the high heat and it worked PERFECTLY!!! No reversion at all.
I also used a teeny tiny bit on each section just before I flatironed...
Blessings and I hope it works for you as well!!! It's the truth agaist reversion!!
cj