I think I found this technique on Pinterest.
I poured rubber cement in a bottle with a spout made for writing. I took out some watercolor paper and cardstock, and began to scribble.
After that dried, the real fun began. I used watercolor crayons, a bit of Gelatos and sprays (from ArtAnthologie & Prima) and water.
I hastened the dry time with my heat gun. When all dry, it took just a finger rub to remove the glue. Note: the underlay is very white in real life.
Love the batik look you get.