GOLDEN OPEN Acrylics remain wet much longer than other acrylics and tend to form skin less on the palette during long painting sessions. The processing time depends on the applied material thicknesses. Thin coating layers adhere to one another, so that additional layers can be applied and mixed. Thicker application layers can be worked with for hours. 16 mm-thick layers dry very slowly. For impasto techniques it is recommended to mix the colors with fast drying GOLDEN Acrylics and Gel Mediums.