Made concrete forms this winter (in the basement). Was taking one of the small rectangle ones out to paint...held it on one side..the other broke off in pieces.It was almost an inch thick.
I did mix it to the consistency of muffin batter and it had months to set up.
Any ideas.? I have 3 leaf bowls which I am afraid to ;move now (maybe gently in box to cut down on the potential breakage.)