The Artist Palette Seal by Masterson is an airtight container that safely holds any type of paint palette between sessions (paint palette not included). For oils, place your favorite palette into the Palette Seal, secure the lid and your paints will stay fresh for days-even weeks. For acrylics and other water-miscible paints - use the Palette Seal with Masterson Sta-Wet Premier Acrylic Paper and Sponge (sold separately) to maintain a moist atmosphere and keep paint fresh for weeks.