Can a 2 stage paint finish be repaired?

The car does not need to be stripped if that is what you are asking.

Dirt can be nibbed out so that isn't a problem.

If the base is so thin that you can see the sealer through it, that's more of a problem.

But anyway..... This is nothing that some sanding and blending couldn't fix. Just remember that you can't stop the clear in the middle of a panel.

For example, if you have a problem that needs to be corrected on the left 1/4, the left 1/4, right 1/4, both sail panels, the roof and both a pillars will need to be re-cleared.