Hey all you homemade wet palette users, i have a questions for you. How do you keep the paint from becoming too wet over time? I have a sponge in a pan with bakers parchment on it and it works great for the first few days. After that it seems as though the osmosis is too much and the paint becomes too watery. Has anyone had this and conquered it? I tried using 2 sheets of parchment but i cant seem to get them to lay flat together. I keep it covered when not in use because its in an area that can be dusty when i am working on other projects. I read somewhere that someone had used a few layers of saturated tissue under the paper but i would think this would increase osmosis rather than decreasing it due to increased surface area contact. Anyone?