User blog comment:Blackendedsoul/Unique Gomu Gomu/@comment-4754162-20120301052813/@comment-4754162-20120301055151

Erm, something like this but towards the end you got a point on the kairoseki part:

Physical alteration : Luffy's body turned into rubber, Buggy's turn into something... erm... slashable (tofu?)

Immunity : Luffy is immune to round bullets but not to sword slashes, Buggy is the other way around

DF ability activation : Correct that Luffy need not activate his rubber elasticity powers, I think Buggy is also the same, I don't recall seeing him having to turn on his DF power, it seems natural for him without the need to be consciously or not alert that some slash is coming - quite unlike the admiral's logia powers spontaneous activation thru training

On the part of kairoseki cuffs, I think you got me there, while luffy submerged in water or cuffed, his body still has the rubbery element but has yet seen whether if lets say we swap Buggy for Luffy during the underwater submerged scene (Arlong arc), can someone just detach Buggy's head and bring it above water or not.