It’s a pretty simple recipe. You can just put a little bit of flour, or even cornstarch into a disposable cup or storage container and add a little bit of water at a time until you get a thick consistency, almost like gloopy pancake batter.
I know the biggest question here is, “Will it wash off“? The answer is yes, it will wash off of your sidewalk, but it may not wash off of your kids’ clothing. Make sure they dress accordingly 🙂