yeah mate. same prob i had a couple of years back. there was a visible breach in the "glue/goop". like i was saying to you, they'll fix it free and you'll get a job sheet saying to wash with fresh soapy water after each use. doesn't really make sense. its either waterproof or it aint. rust isn't fussy, its just faster with added salt. happily the i pilot solves that problem and no doubt you'll have yours before it can corrode again.
cheers mate