AIRBRUSH FLOW IMPROVER 562 - The Airbrush Flow Improver is designed to improve the flow and delay the drying of paint on the needle while airbrushing. It is recommended to ad 1-2 drops of Flow Improver to 10 drops of paint in the cup of the airbrush. 200ml plastic squeeze bottle. VALLEJO: Since Amadeo Vallejo founded the company in New Jersey (USA) back in 1965 and before returning to Spain, the core of Vallejo?s business has always been the development of acrylic colors; from the late ?60s for animation studios, through the first acrylics for fine arts manufactured in the ?70s, to the first ranges for modeling formulated in the early ?90s.