I’m interested in putting in some additional D-rings on the kayak

I’m interested in putting in some additional D-rings (like this: http://www.nrsweb.com/shop/product.asp?pfid=1462) on the kayak so I have more mounting points for straps and such. Do you have any recommendation on what to use, and how to glue them on?

The NRS Hypalon D-ring patches you found should work well. I might suggest using the 1″ D-rings rather than the 2″. You would glue them on like you would any patch on the material.