http://www.forrestrace.com/stepping-stone/
What will glue my stepping stone back together?
We made a stepping stone from a childs set from target. The cement type stuff was a white powder add some water and it hardened pretty fast. if it helps it got really warm once the water was in it and its not really a stone. Before it dried all the way the cat stepped on it and the corner broke just wondering what would glue it back together if anything. Its only about 1/4 or 1/2 an inch thick
From your description of setting, it is plaster of Paris and you can glue it with household glue, Goop Craft glue, or epoxy once it is completely dry – not cool any more.
I don’t know if superglue works well on plaster, which may be too porous.
Duffy – Stepping Stone