This was a lot of fun. My almost-three-year old loved it, as did the baby.
It is easy to make, but the experience comes with a couple of caveats for the parents. Of course, if you do this outside, then there is nothing to worry about!
In a big tub mix flour and baby oil. This is what most of the recipes I have seen call for.
the ratio is 8:1 flour to Oil. We did 1 cup of flour and a 1/4 cup of oil. This seemed to work well.
Caveat #1: Do not use baby oil if you have kids who are "tasters", ie. likely to "taste" the flour. Mine had to taste it, despite my warnings, and they were pretty sour mouthed about it. One recipe I saw used canola oil and the user said it work the same as baby oil.
Play freely and crazily! My toddler was a little unsure about the oily texture at first, but he soon got over it and had a ball.
He had so much fun that he had to climb right into the tub. He then told me "we are having so much fun!" Yes, we were.
Caveat #2: If you do this inside, your floor will get not just dirty, but oily- baby oil oily, which means it will be dangerously slippery-- and hard to clean. This is where using a vegetable oil would probably, again, be a better idea since it is likely easier to clean than baby oil. Of course if you do this outside, then there is not much to worry about.
We got out some containers and filled them, packed them, etc... it was fun. And then we put everyone in the bath.
We will do this again!