That lens looks like a disaster. Yes, it could be recoated/recemented (I cannot really tell what it's issues are), this would probably cost about as much as two or three (or more...) such lenses in good condition. Buying lenses with problems and having them repaired is a very expensive proposition, these lenses aren't exactly rare.
Originally Posted by randy6
Where are you sending your lenses? Does your repairman have knowledge and experience?