Yes you can use them by hand but it will be harder to do than it would be using a ball spinner.
Tips: yes try to keep the pad(s) damp when using them as it will make them last a lot longer
they will eventually wear out but using them damp helps keep them in good shape and using
them dry clogs them up faster.
I use a spray bottle with water in it I just spray the pad and ball but I have a ball spinner so if
doing it by hand I guess just keep the pad sprayed down and rub hard I also use a dry towel
to wipe off the ball after sanding it down.
Now as for over using them I'm not sure what you mean by that but you will wear the pad out
before you will wear the cover off of the ball if that is what you mean.
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