Liquitex Slow-Dri Fluid Additive thins all acrylic paints and mediums while extending working time by 40%, so paints remain blendable for longer. Featuring a thin consistency, this fluid retarder lowers viscosity without affecting transparency. - Liquitex Slow-Dri Fluid Additive - 4 oz bottleLiquitex Acrylic Medium, SLO DRI FL RETRDR 4OZ -