You don't need to set up a separte partition.
There is the os x installer for this very problem
Once you go to the site it will immediatly begin the installer download.
Though you made need the actual disks for the install. But like Don
said you could attempt contacting them.
Or What I've done in the past is used clear car polishing wax. It works
super well. Just coat it, let it sit for a minute and wipe it carefully off
with a soft cotton rag. It will still look scratchy but it fills in the holes
Unless it is beyond repair. If that's the case... Good Luck sir!