OPEN Acrylic Gel is supplied in the same consistency as the colors and is used to extend the paints while maintaining working properties. OPEN Acrylic Medium is formulated to a lower viscosity and is used to extend paint and maintain properties when a more fluid mixture is desired to increase flow. OPEN Thinner contains no binders and is used to thin the consistency of paint mixes without altering open time, or to maintain and adjust the workability of colors on the palette without the use of water mist and moisturizing palettes.