When I used to relax my hair, I used either Revlon Realistic Lye Relaxer, or Creme of Nature Lye relaxer in mild or regular. I really liked the Old School relaxers except for Dark and Lovely. My hair would get very straight very quickly with the two aforementioned relaxers. It didn't take any time at all for the relaxer to straighten my hair, usually when I finished my head, I immediately rinsed.