You can mix paints on the wet paper without tearing it.
Sta-Wet Painters Pal contains five sheets of Sta-Wet acrylic palette paper, cellulose sponge, palette tray and lid, five paint cups and detachable lids, one solvent cup with attached lid, storage area beneath removable cup holder tray, compe Once the lid is closed, the paints will stay in workable condition for days, even weeks. Saturate the sponge and place it in the tray. Lay the palette paper on top of the sponge, wipe off excess water from the paper, and put your paints on the wet paper.