I leave it on if I'm not sure I will like the racket. Once I decide I like it, it take it off and re-grip again.
my coach in china says to leave it on, so that sweat cannot seep into the undergrip, but now the plastic is all cracked and falling apart...should I take it off?
I've tried leaving the plastic on once...never again. I could feel the grip on top of the plastic moving about a lot during play.