Nick,

     Now here's an example of what I was saying in my post the other day about
exposed copper being a defect not due to the copper itself being exposed, but
due to another problem.

     Why this would be a problem is because of the possibility that flux or
some other contaminate entering beneath the mask from where it had flaked
away, becoming trapped and not cleaned away. The fact that the copper is
exposed is not the problem, but the broken mask is.

     So in short, this should be corrected by cleaning the area thoroughly
ensuring that there are no contaminates trapped beneath the mask, and then
spot repair the mask.

-Steve Gregory-

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