Hands slipping during Stall Bar Reverse Leg Lift

I am doing my workouts at the health club.  They have a metal set of stall bars.  I have been able to do 4x10 and the 5 set, I can do 8.  But I am only stopping because my hands are sweaty and are slipping on the metal bars.  I am sure that I am capable of doing the full 10 reps of the last set, but I am concerned about taking a header to the concrete floor if my hands give way.  

Any suggestions? 

 

HI Stefan, in these cases I tend to use a little piece of elastic band around the bar, there are good to improve the grip.