Masterson - Sta-Wet Palette Sponge - 8.5x7 - 1qty - For use with the Masterson Sta-Wet palette system. This sponge is for use with the Handy Palette size 8.5x7 inches. Simply wet the sponge, place it under the Sta-Wet paper, and seal your unused paints in the Masterson Palette. Your paints will "Sta-Wet" until you are ready to use them again! For use only with water-soluble paints.