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Okay I was right.
It does strengthen your generalize attacks/weapon.
But what about when punching a logia and not thrusting haki?
I mean you saw the series of base punches luffy was beating Cesar clown with before passing out from no air right?
Well it took Koka Haki to break his face in.
Why is that so?
I always figured that a single punch from regular Haki luffy, was just a regular base hit.
Only that Haki allowed him to touch the matter, the rest being his strength.