What is it with kids and salad spinners? This is one of my go-to crafts when I need to entertain a troop of preschoolers. They just want to paint rock after rock- probably because they get to squeeze paint and push a button.
You can up the educational value of this craft by counting the times you press the spinner or talking about mixing primary colors to make secondary colors. I also love that the mess is fairly contained within the spinner.
I hope you enjoy this colorful craft!