Shindo said:
Yukikaze, Gekko and Kasha effects stick a lot of the time. Especially with a Hagun. It actually is rather reliable. A good SAM won't overlook the enfeeb potential. There've been a few times when I only survived because I para'd or blinded the mob.
Unless the mob is completely immune to it, weapon skill effects have little to no resistance, however the duration is subject to TP mods (if applicable). Extra TP does not enhance or further increase duration of YG or K.