I enjoyed your palette class, Peggy. Although I've created dozens of palettes and color charts over the years, it's always interesting to see if there is something more I can add to my toolbox. I did find one tip about making a finger imprint in the well about 24 hrs. or so after filling a new one!  So I have one for you too that I didn't see you mention ... After you make your color chart, cover it with a laminating film (found in the stationery store) so that when you spritz your palette, it won't run, and it won't get messy. You can just wipe it off.  Thanks, Peggy! Hugs and Happy Creating!