Spread the old sheet onto your working surface to catch paint drips, remove the top of the umbrella and set it aside. Sand the shaft and spindles throroughly before applying the first coat of paint.
Paint the underside of the umbrella first so you can continue painting the top without having to wait for the inside to dry. Allow the first coat to dry completely before applying a second. Let the second coat dry overnight.
Decorate using stencils or utilize the masking tape to achieve a striped effect. Patterns look better when finished with a border. Remember the colors are likely to last longer if they are a lighter shade.
Apply a second coat, taking care to place masking tape or stencils accurately. Overlapping will cause the pattern edges to look blurred. Allow to dry overnight. Spray with the sealant to provide extra protection against the elements.
Place the umbrella in the shade for a day or two before exposing it to the hot sun.