Homemade paste is not sticky. Why not make insoles? The two layers of cloth don't stick together. Why?

Reminds me of how my mother made shoes for me when I was a child. Now that my mother is gone, no one makes shoes for me anymore. Alas, I remember when I was a child, my mother made her own paste, and then she found a small table, spread the newspaper first, then began to brush the paste, and then she spread it layer by layer, and so on. At that time, the homemade paste was mainly leftover corn porridge with some flour. Sometimes it was made directly from flour, diluted with cold water, and then cooked on the fire. The more it was cooked, the more sticky it became. You don't insist now. I guess the paste is too thick. Cook it again.