Glue Art on Canvas with Watercolors

We've been experimenting with various glue effects on canvas with watercolor art. The first was an accident, really. The girls and I each made a collage with small items such as buttons, beads, paper butterflies, etc. After the glue was dry, Daphne and I painted our canvases with liquid watercolor paint. And the glue concentrated the color rather than resisting it. In working with glue on paper, I had come to expect glue to act as a resist. But on canvas it was doing the opposite. Why? When…