mark, if it only coating it is not tragical. if it is element then this is a more serious demage. the effect can be different, depending on the demage level (if the element was demaged). depends on light condition, some condition can acentruate it more. depends on the enlargement. when u take pictures, exemine it, just remember that if something should accure than it will be in fully reversed diraction.
i dont know if it can be repaired but if u do go on it give it to the best master to do it.