Fusion Developer - Flow Boost Optional to Enhanced Flow. Smoother Application. Airbrush Optimization. Fusion Flow Boost is an optional additive designed to be used with Fusion Stain and Fusion Flow Developer to enhance the airbrush application experience. Formulated to help improve mixture consistency and machine flow, it supports smoother spraying, more even distribution, and greater control during brow staining services. While Fusion Stain is fully formulated to perform with Fusion Flow Developer alone, Flow Boost can be added based on artist preference to help optimize airflow, improve application comfort, and support longer-lasting stain performance. Ideal for artists seeking maximum precision and customization in their airbrush brow services. FOR PROFESSIONAL ONLY