glue gun

so what would you recomend insted for mounting a largish piece of monti to a piece of rock?
I have a couple pieses I have prieviously monted one piece tat kind of formed the same shape of the rock it is mounted to almost perfictly so I used gel super glue by titon. These pieces do not conform to the rock that I have and will have very little area to mount there for I believe that I will need a different method.


Bill