I happened to contact Outcast just this week to ask about the Scotty glue-on-mounts for a different application and this is the response I received, FWIW
"We have glued on the scotty pads in the past, but stopped using glue once we started using our Integrated Gear System (IGS). We wanted to limit our use of glue, because glue breaks down over time and we wanted to find a more permanent solution. The adhesive we use for repairs and adding glue on accessories is call Stabond. It is a two part adhesive and are sold either by the pint or quarter pint."