User blog comment:AYET/Against logia/@comment-3213092-20120702125806/@comment-4374114-20120703183427

Not sure why it wouldn't work, if Luffy simply putting just one foot into sea water would make him weak, a glass of it I would expect to weaken him to nothing. Of course then it leaves open so many other possiblities, soaking clothes in the sea and then tossing it on the DF user. Though I expect if that ever is confirmed to be true it will also bring up the debate of why don't the pirates experience the issue when on their ship, as just about any sailing ship I've been on there blow back from water hitting the sides.