Here's my advice

1) Never fear
2) Go for it
3) It's going to be heavy, you'll probably have to work on location
4) Plenty of curing time. I wouldn't man handle something that big for at least 3 or 4 days
5) If you're going to transport, I've heard that something 8 feet wide should at least be 3 inchis thick (don't remember where I heard this, and it was for square and rectangular shapes, so you'll want to think of something similar for your shape)

Maryo, did you need to reinforce it with anything? Thanks

mermaid, Is there any reason why you're using a baby pool as a mold/form? Can you just dig out the soil in the shape of the stepping stone and pour your concrete. Speaking of which, you really should use concrete for strength and some rebar for this size stepping stone. Billie

I'd really like to see what you're doing with the ribbed foam. Pix, please.

David

We didn't put any reinforcing in the rounds. If we had colder temps or were going to move them I probably would have used the fiberglass reiforced mix. I've used the fiberglass reinforced mix for my orbs too. I sift out the rocks and fiberglass then put the fibers back in. I'll take pics but it'll be awhile before they're posted.

Thanks, everyone! Well, we just went for it. I have no idea if it will work. They're huge! I didn't KNOW we could just dig and hole and pour! sheesh...next time for sure. We're planning to just let it cure for...uh, forever, basically. lol. I'll keep you posted.

Suggestion: I decided to make a hypertufa canopy for a faux bois tree trunk I made. I excavated an inverse dome into my kid's sandbox...final dimensions were 4' wide and 3' tall at the center. I used puffed rice mixed with wood glue to make surface 'imperfections' in the canopy so it wouldn't be too regular. I watered it for days...and when I wanted to remove it I realized it must weigh in the order of many hundreds of pounds. Laughing...I couldn't pry it out of the ground and now I have a bizarre buried sculpture in my kids sandbox that will be there forever.

Oh...my suggestion...if you're going to have to move the large stepping stones lay out some ropes or straps to be able to carry or move the end product.

Ok, Ok, no one is asking the obvious question.

Why do you want such large stones? Are they mini-patios? Stepping stones for Bigfoot? A way to eliminate mowing so much grass next summer? Your own private islands (in which case we would have to discuss "floating"...)

Whatcha gonna do with em?

Hi... just new to this site Oh my I will never get off the computer now! This is so great .what a wealth of information here.. anyhow I have a question about creating stepping stones... I just recently made a stepping stone from a mold... its quite detailed Im thinking I made a mistake in using Mortar mix for it.... versus concrete... I did put that metal mesh in the middle of it but it seems like the details might just rub off... Help... It looks great but I need some advice on what is the best to use or is there some sort of a finish I can put on it to protect it....