The paint was thick enough to stay on the acrylic, giving Caleb an interesting surface to paint on. Usually finger painting is done on a horizontal surface, and he seemed to appreciate the challenge of experiencing it done vertically instead!
The sunlight shone through the paint and illuminated it, much like when one finger paints on a light table. It reminded us of beautiful stained glass.
Clean up was easy! We just sprayed it with the hose. Don't have an outdoor acrylic easel? What about trying this on windows? (maybe perform a spot check first...just in case!)