I very seldom back bows and the only reason I mine useing this stave is I wooded the backing off I can't even remember when. The guy wanted to go as cheap as he could so it was there I gave the guy a break to use it.
Raw would work fine just another step to do so if I do'nt need to I don't just lazzy I guess but I've always been this way. I would even but the skin on but he wants it. I've built a couple OSAGE and left the sap wood on that really did'nt need it.
I know some do wander how much protection the sap wood is. I know it's some BIT THE # OF BOWS I'VE BACKIN THE LAST DOZZEN YEARS I CAN COUNT ON MY FINGERS.