When you "Buff" it up you can actually eliminate a ton of the bad spine wear during the restoration...

The best analogy I have been able to come up with is a rutted road... If you continue to drive in the ruts (uneven spine and bevel) they just get deeper (more uneven wear)... BUT if you smooth those ruts out (restore, then tape the spine) you can get a nice smooth drive (bevel) again... That is the best I can explain it...I hope it helps