Strip the wax finish off the ball. Soak a cloth with vinegar and wipe the ball down.
Sand the surface with a fine- to medium-grit sand paper. Paint more readily adheres to a rough surface rather than a smooth one.
Determine whether the finger holes should be filled. If they won't be used for pegs or a design element, seal them with wood putty. Keeping moisture out will ensure your project will withstand the elements better.
Stabilize the ball. A tiny bathroom trash basket or a large coffee can work well. This will act as a stand when you paint it.
Prime the bowling ball with spray paint. Select primer intended for plastic surfaces. Allow the paint to dry.
Rotate the ball and spray the missing spots and allow ball to dry.
Add desired paint color after the primer coat, allowing each layer to thoroughly dry. Many metallic polyurethane paints are on the market. Spray in a solid, consistent layer for a traditional look or create special effects.
Follow the steps for bowling ball preparation.
Apply silicone adhesive to pieces of glass or tile and place each piece on the bowling ball. Place all the pieces and make adjustments before applying grout.
Mix grout. In lieu of water, an admixture can be used to stiffen the mixture.
Apply grout in between the tiles or glass pieces. To ensure full coverage, do not hesitate to cover the edges of the mosaic pieces. Allow grout to cure for 10 minutes before removing excess.
Wipe excess grout with a wet cloth. Let the grout set up for another 10 minutes or more. Seal after 24 hours if desired.
Place the new gazing ball in the garden. Hide it among foliage or place it on a sturdy stand.