CherokeeKC.  I have made them both ways, and it really depends on the look you want.  If you want a dull, camoflaged arrow, do nothing.  If you like the more advanced clean look, I scrape the rind off of mine.  You will loose about 2 lbs of spine and some weight when doing this.  When I make my cane/bamboo arrows, I start out with a calculated spine weight for  the specific bow weight/draw length/piont weight that I want to make and go from there.  I have never lost enough weight or spine to make that calculated arrow not work.