WHAT IT IS Bonacure Fibre Force Spray Conditioner is a leave-in conditioning treatment that detangles and nourishes damaged tresses. WHAT IT DOES Schwarzkopf Professional BC Bonacure Fibre Force Spray Conditioner is a leave-in conditioner that strengthens damaged hair and builds it up again. The hair will immediately comb tangle free. Micronized identical hair keratins penetrate deep into the hair cell membrane architecture and fill the complex again. This cell connecting cement is responsible for the strength and resilience of the hair fiber. Within 4-10 weeks depending on the hair quality Fibre Force strengthens the hair and restores original hair quality.