[thesearethetimes...]

Interesting - hubby agrees - says it could set underwater?

[JeanLM]

Yes it could set underwater. Made synthetic Zeolite and it worked fine for things like railroad ties but nobody wanted to pay the difference.

[snoringbear]

“ Interesting - hubby agrees - says it could set underwater?”
**********

Present day concrete cures underwater as well. The operative word is “cure.” 😊

[Gaffer]

Yes, that’s one thing I remember in writings and videos about it.....