It's fun and easy to decorate a nylon umbrella with acrylic paint and a brush. This is a perfect project for kids because they can choose and apply the design all on their own -- or with a little guidance from a parent. Be sure, however, that the paint is acrylic as other paints don't have the same waterproof qualities. To make a painted umbrella, cover a work surface with newspaper, open up a child-size umbrella, and start painting. Keep the umbrella stay open overnight to allow the paint to dry.