Gyro,

althogh T-88 is waterproof. It is not water vaopor proof. Therfore water
being 2 parts oxygen to 1 part hyrdrogen will allow oxide to form and
weaken the joint. as a matter of fact the low tech test that boeing uses
is called the wedge test, which consists of the test coupon being
etched, primed and bonded as a lap joint, A wedge is then driven between
the lap and the end of the split marked, then it is set in a high
humidity environment with I believe and incandesent light on it. if the
debond line progresses any further in x amount of time then the bond fails.

I will research more over the weekend and post more on monday as ya
got me wondering about it it now.