Definitely and you don't have to use the scrim because the styrofoam ball will not be removed.....unless you are using a pretty big ball. Just smear the cement mixture on the ball. Hope this helps. If you can, please take pics of the process and let us know how it's going.

Thank you serenseen, I appreciate your response. Just one other question, would I be able to leave these outdoors? I've just started doing mosaics. Right now I'm working on a little table.I would try and take some pics when I start working on the balls. Thanks again.

If you use the right adhesive, I dont see why not. also there is a product called rigid wrap you could use to cover the balls instead of cement...Im not real sure about the outside part though with that.

I have done this and what I did is I used the dry wall tape with the holes in it .It is like a meash .Then use thinset on the ball and layerd the tape and ts .I did one good layer then put a thin coat over it all .The put my tess on with ts.Been out side for a while do good.I hope you understand this.

I sure appreciate your answers and nanatricia I understood your explanation. Thank you.