I did a little painting yesterday and used the wet palette. No matter what I did they just kept drying, even after the paper was basically floating on the water. I assume the paper was the issue it had been opened a while ago. Today I did a little with just a normal palette, one of those ones with tear off sheets. Stopped for about 2 hours and returned to mostly still wet paint. As best I can tell temperature and humidity haven't changed much. It's pretty odd (but probably explainable)