I have a saltwater fly line that has 2 abrasions - one at about 45 feet and one about 50 feet (those oyster beds are nasty!). Each is about 6 inches long. The abrasions are tiny nicks in the line and aren't readily noticeable just by looking at the line - but you can feel them when stripping line in.

Anything I can do with it, short of replacing the entire line?