I have used Aeropoxy ES6209 for many structural adhesive jobs, and
have measured the strength
of various bonds. I would substitute it for the Lancair-specified
Hysol without hesitation.
ES6209 gives good bonds between both composites and metals, and has reasonably
good high temperature strength after a full cure.

Full disclosure: PTM&W, makers of Aeropoxy, sponsored an ultralight
sailplane project
that I worked on. The main reason I am more familiar with the Aeropoxy
family is because
I got a very good price. Seeing as how that was a glider, I didn't
check compatibility with
gasoline.

I also use a lot of their laminating resins.

Don:
If you'd like to try a sample of the Aeropoxy, let me know. I can send
you a bit.

-bob mackey