Hi, I absolutely love the way the oil paint mixes on the canvas with other wet oil paint. What I can't work out though is why no blenders have the same effect. Sometimes, a blender - usually the palette knife - gives me the pleasant surprise of smearing the paint in the same way as the oil brush, but this is rare. Is that because the paint dries over time? And if so, is there a way to keep it wet, to switch it back to wet mode, or to tell which paint is dry and which is wet?