This is the eternabonded corner five years after I applied it.

The bottom was repaired twice so the tape is wider and the metal is bent but it won't leak which is the important thing.
I used two strips of 2" tape and wrapped one over the edge and then the other over that. I also did the roof seams and all the lights including those pesky overhead lights. So that the only opening to the inside was for the wires and those are on the upper side so water would drip down and out.
I think eternabond is great stuff. It flexes enough so that no future cracks are possible and keeps the water out. But it takes some time to apply. I have to do the front edges and unfortunately I put off the job long enough that I found water inside after the snow and ice of November.