Is it true that evaporated milk (canned milk) is a super glue to pottery?

Answer 1

Casein, one of the ingredients in milk can be a glue and has long been used for a kind of paint. I doubt it could be called a super glue if you mean extra strong. If you mean instant grip, it might if the pottery sucked the water out.

Answer 2

I'm assuming you mean on wet pottery. I've never heard of this but you can also use sodium silicate, found in some pharmacies/drug stores, a very small amount mixed with slip can work like a glue for wet or leather hard clay.