Dad tried the foam in a can. You can see where it oozed on the outside of the building and the sun turned it a dark brown. The leak is still there.....
I might have to take the windows out, clean all the foam away, make a small raingutter over each one and re-install, caulking them well. These don't have a flange on them, they are double pane vinyl windows that you could use in a house. 2'x4' non-opening.
Thanks R&R!