Plastic Oil Dipper often uses drying oil, volatile oil, and other painting oil mediums to alter the stretch and luster of the actual paint. Just as they have quick access to the paint on their palettes, painters can thus work much more efficiently when they have oil at the ready. Oil dippers are lightweight containers that clip on to the edge of the palette, providing artists with a convenient, portable way of mixing oil with paint, and also have lids that store and preserve painting oil medium when properly sealed (although oil dippers are not recommended for long-term storage). Oil dippers come in many shapes and configurations. 1 Pcs of Oil Dipper.