My memory is that the adhesive
a) is currently in use in Europe.
b) is not impacted by moisture
c) does not go off, so the pipe/hose lines in the Hadrian do not need purging/cleaning between jobs (like they would if mortar or cement based product was used).
d) has a quick setting time so that even on short runs there is no waiting time between courses.
To find reference to these things you would need to go back through the interviews and announcements,
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