Sidewalk paint is such a fun activity for the kids! All you need is cornstarch, water, and food coloring.
This is by no means a picky recipe. I just eyeball it. I added cornstarch and water to each muffin cup and mixed. It should be pretty watery. Then I let the kids add the coloring.
The trick is to stir the paint with the paintbrush when you dip the brush brcause the cornstarch settles.
Hope your summer is off to a great start!