Large concrete balls can be difficult to make and also find finished. The weight is obviously one major factor. We have shared step by step instructions for using a yoga ball as a mold for concrete. The outside layer is very thin
Last year my father and I decided to make a large concrete sphere using a Yoga ball as a form. It turned out so amazing!!
I finally finished editing this step by step video below that we shot while he was working on the project the first time through.
The only recommendation we have is to do a third layer. The thin set/ concrete was very thin and although it is still being used at a local feed store it does have some bruises. So be sure to take the time to finish a third layer.
The end of the video shows him acid staining the ball.
Thin set Laticrete Mega Bond
Small hose and valve ( to deflate the ball )
Small tub for mixing the thin set
Bucket- To stabilize your yoga ball
Thick rubber gloves
Acid Stain for concrete
Plastic spray bottle
Adhesive mesh– In a large roll – To cover the ball
Adhesive mesh– In a small roll- To wrap around the large mesh- to hold in place