CARE FREE CURL CURL BOOSTER 15.5 oz Curl Booster is a mild permanent wave lotion that aids the Chemical Rearranger in processing hair. This light blue lotion helps ensure strong, beautiful, long-lasting curls. Curl booster should be used with caution. It aids the Rearranger in processing difficult-to-relax hair. This mild ammonium thioglycolate product ensures strong, beautiful, long-lasting curls. Aids in keeping the hair moist until wrapping is completed. Use after Care Free Curl Rearranger.