Old man, your post rating just increased! That was great.

I dare say my race planes get as much strain on the firewall as any of the other type planes out there. If not from flying, then from my crappy landings.
After five years of using GG for firewalls, wing saddle, landing gear plates, etc, the glue has never been the point of failure.
Storing it upside down helps a little but here in humid NC it only lasts about 9 months, by then it's almost gone anyway. I only buy the little bottles to keep it from going bad to.