some clarification: i think flour and water actually make paste, which is a bit different than glue. Most glue has other ingredients, chemical or natural. And the paste made from flour and water is not very good for adhesion---it only works on very light very thin materials that are porous.
Most cakes from scratch do not use water, but some other liquid ingredient, like milk. Cake mixes use water and/or milk to reconstitute chemicals dried out in the flour at the factory---so it's not pure flour.
Bear in mind that eggs can also make tempura-like paints (back in the day).
There are basic recipes, but the combination of specific things in specific quantities make a "batter" which can have several applications, depending on the specific nature of the ingredients used.
Reminds me of SNL's "it's a floor wax, it's a dessert topping"
Will: They don't give out awards for helping people be gay... unless you count the Tonys.
"I guarantee that we'll have tough
times. I guarantee that at some point
one or both of us will want to get out.
But I also guarantee that if I don't
ask you to be mine, I'll regret it for
the rest of my life..."