Masterson offers a variety of easy ways to keep your paints fresh while working. Your acrylics or oils stay fresh for weeks! Masterson's Sta-Wet palettes are made of lightweight white plastic that cleans up easily. The Palette Seal is airtight when closed. Disposable palette film is available for acrylics or oils. The sponge layer creates a damp atmosphere and keeps acrylic film moist (remove for oils).