User blog comment:Rocket.knight.777/Opinions on a possible fic/@comment-4080028-20140821055338/@comment-3396538-20140821134733

Just in reference to the water weakness. The standard devil fruit weakness is all water, except moving water (eg. Rain, Waves, Waterfalls). Luffy is permanently transformed into rubber, so submerging him in water will only weaken him, not remove his ability to stretch. For an active ability like Mr. 1's blade arms, if he was submerged in water, he'd be unable to do that. Although his body would remain as hard as steel.