any info about benzocaine for waxing??

hello 

i just came across this numbing product whose active ingredient is "Benzocaine 20%"

is this really enough to numb the pain of waxing in tender areas? i wax my legs and epilate my arms, so i'm used to the slight stinging, but i can never EVER overcome the horrendous pain of waxing underarms or "down-there"... anyone know if this 20% is strong enough to lessen that pain to a simple sting?

i did some research and found that electrolysis people use this concentration to numb their skin before treatment, but i couldn't find any testemonials on how effective the numbing products are.

help!

thanks in advance