Hi Peter
Glue sold specifically for Corian isn't clear usually it's especially colour matched to the Corian sheet so you can make invisible joints. (An epoxy acrylic/stone mix and bloody expensive).
I know this as for my business, I have bought it a number of times for kitchen worktops as well as other brands.
I still have some of the leftover colours with the thought I might mix them and cast something. One of those " if I ever get around to it things " 