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OPEN Mediums help maximize working time of OPEN Acrylics and can be used to adjust color strength and translucency while maintaining consistency. OPEN Acrylic Medium (Gloss or Matte) will lower paint viscosity to create a more fluid mixture and increase flow. OPEN fluid mediums are also useful for lowering the viscosity of Heavy Body colors and slowing the drying for detail painting using fine brushes. 

OPEN Thinner is a water-based additive for thinning the consistency of OPEN Acrylic Colors and Mediums without altering drying time. It also maintains and adjusts the workability of OPEN colors on palettes, and can be used as a thin-bodied retarder with Heavy Body or Fluid Acrylic colors. Because OPEN Thinner contains no binders, it does not form a film and should only be 25% or less of mixtures with acrylic colors and mediums (one part OPEN Thinner to three or more parts paint or meduim).