Is it worthwhile to use a wiper insert to improve the surface finish
of brass when doing a facing operation.

I have a 3" face mill, and would like to get the best face finish
possible. I am using sharp, positive rake Iscar inserts currently, but
wonder whether adding a single wiper to teh cutter would result in a
better finish.

If the answer is yes, what is the incremental finish quality one can
expect (some experiences would be nice - ie Ra finish before and
after)