Fusion Developer – Flow Boost Optional Airbrush Additive for Smoother Flow and Greater Control Fusion Developer – Flow Boost is an optional professional additive for artists using Fusion Stain with Fusion Flow Developer. It is designed to enhance mixture consistency and machine flow, helping support smoother spraying, more even distribution and greater control during airbrush brow-staining services. Fusion Stain is fully formulated to work with Fusion Flow Developer without Flow Boost, so the additive is used only when the artist wants additional flow optimization based on technique and preference. It can also support application comfort and longer-lasting stain performance. It should be used only according to the professional Fusion service protocol. FOR PROFESSIONAL ONLY.