What glue to use to hang slate

Chrissy asks: How do I stick hangers onto the back of slate so I can hang it on the wall without drilling holes in the slate?

I would try the two-part epoxies. They have been used for tack welding metal so it should be able to hold the hanger to the slate. I would use some sandpaper to scuff up the slate, if possible, before gluing.
Hope this works!
Judi