I've often wondered about Hysol.
It ain't cheap, IIRC - but a lot of people seem to use it where an extra-stregth epoxy is required.
Like gluing the turbine blades together in a Change Sun CS 12 blader when they up the LiPo & RPM to ensure they don't explode at increased max revs
I have also read that it's a bit 'stiffer', and won't run everywhere as easily as "normal" epoxy does.
Must get some one day and see what all the fuss is about...