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How to Make A Lightweight Concrete Garden Sphere for Mosaic

Concrete Garden Sphere Instructions
Copyright Institute of Mosaic Art

You will need:  
•    6”-8” diameter rubber ball—the kind you can get a Toy’s R Us 
•    A 2” wide roll of alkali resistant fiberglass mesh—you’ll find this at Lowe’s or Home Depot in the tile section of the store 
•    3 lbs Parex 121 “Dry Base & Adhesive” acrylic concrete
•    A dust mask
•    3 pairs latex or nitrile gloves
•    Protective covering for your workspace
•    A bowl big enough for your ball to sit in while you work leaving most of the ball exposed
•    A small piece of bubble wrap 
•    A paddle to mix the concrete and to spread it on the ball
•    A mixing bowl for the Parex
•    Scissors

Steps:
1. Cover your work area with plastic or a tarp. Place the ball on a square of bubble wrap in a shallow bowl.  

2. Cut the fiberglass mesh into approximately 2" x 2" pieces with scissors. It will be sticky on one side.  Pat the mesh sticky side down on to the ball, overlapping the pieces slightly until the ball is entirely covered.  

 
 

3. Wearing a dust mask and gloves, mix one third of the Parex acrylic concrete with water to the consistency of thick cake batter. (Once the Parex is mixed with water you no longer need to wear the mask.)

4. Use the paddle to spread the Parex, and cover the exposed areas of the ball and mesh with a thin layer of concrete. You will not be able to cover the part that is resting in the bowl. When upper part of the ball is completely covered you can use your gloved hands to smooth the surface.

 
 

5. After you have covered the exposed part of the ball allow it to dry until it is no longer sticky to touch (note: do not dry it in the sun), then rotate the ball, placing the concreted side on the bubble wrap and cover the bare area with concrete.

6. Repeat applying the mesh and concrete layers two more times, for a total of three layers. *Allow the ball to completely dry between coats.  
(If your ball is larger than 10” in diameter you will need to add one or two more layers of mesh and concrete to give the ball rigidity. This would equal 4 to 5 layers total)

 
 

7. When the ball is covered with all your mesh and concrete layers and dry, use a pin or small drill bit to puncture the ball inside the concrete. This lets the air out of the plastic ball.

Now your ball is ready for mosaic!

A complete Garden Ball Kit with all supplies and materials needed is available in our store at IMA or online at MosaicStudioSupply.com.