When I heard that Privateer Press was putting out a wet palette for figpainting I did some research, and learned how to make my own. Ironically, I ended up using a Privateer Press blister box, a sponge, and some wax paper. Total price tag - FREE (I had all the materials on hand.)
It worked great. Wet palette painting has added a huge new dimension to my work, and I demonstrate it all the time at the Friendly Local Games Store.
Friday I picked up the P3 Wet Palette, figuring that it would be better than what I'd put together. Boy was I wrong.
The P3 system is designed to wick water slowly (the "sponge" is a sheet of blister foam. Not absorbant at all, though it LOOKs like a sponge) up to parchment paper that is designed to wick water quickly. The box is not air-tight, and has a lot of air in it thanks to the high lid. The result? Paint dries out in a day at the most. Other flaws -- after a day or two the paper has a tendancy to curl right up under your paints, quickly drying your blends. The pad of 20 sheets, therefore is good for a minimum of 20 painting sessions and a maximum of 40 (assuming your sessions are paired back-to-back.)
My system (kitchen sponge, wax paper, Privateer Press blister box) wicks water quickly to the paper, which wicks water quite slowly. I've had paints stay good in there for WEEKS, and have painted with the same little puddles for several sessions in a row.
I've been experimenting with the P3 palette for two days now, trying to see if I can get it to do what I need it to. It has failed for me repeatedly. It's better than NOT painting with a wet palette, but it's far too expensive ($20) for a plastic box, a sheet of cheap foam padding, and a pad of parchment paper that conspire to not work together as well as something you can build for free.
I love the P3 paints, and adore their miniatures. It's a shame this product is such dross.