Potion 9 for Human Hair Wigs & Extensions. Sebastian Potion 9 is a wearable styling treatment. To restore hair’s natural condition, protect, enhance manageability and renew shine. PRODUCT APPLICATION Apply Potion 9 to damp or dry hair. Blow- or air-dry for silky, touchable looks. On dry hair, reapply to add texture and control. Apply anytime for an instant style boost.