Welcome Nursemaid to our forum. I have dabbled with regular marbles and did not have any luck with them staying put. Others may have a solution for you and will give a shout I'm sure.

Kat

I usually use the GE sil 11 on most of my things, but on another site I been interduced to Quick Grip and it's really quit good...It's not gooy like silcone but it WILL hold...It's waterproof...

One tiny drop of hot-glue in the middle will keep the marble in place while silicone glue cures.

dcarch

HOWWWWWWWWDEEEEEEE!!! Welcome!!! We need a nursemaid on this Forum.

I would indeed give round marbles a go!!!!!!! But I would grout the ball after the marbles have dried in place. But that is just me and I'm not quite grounded this morning. I loved the "a spot of hot glue" idea. Maybe hot glue and "Quick Grip" would be a good combo. Never trust hot glue alone for outdoor projects. Done it. Dont last. Also I would do the marble gluing in stages to allow different areas to dry tight before turning the ball around.

You ARE going to post a pic of that cobalt blue marble bowling ball when you're done, right??? :)

Welcome!
I'm in Pensacola too.
See my website.

http://members.cox.net/nonacook

Thank you for the ideas, and the warm welcomes :)
The Quick Grip sounds like what I should use, I am awful with a hot glue gun.
I will post a picture when it is done.
And Nonacook, I've been to your website so many times :) I absolutely love everything you've created. I threatened to plant flowers in my husband's boat if he doesn't fix it, and then I showed him the one in your yard. He's a little worried that I might do it, lol.
Again, thanks everyone :)