As I stated in my earlier posting, there are certain epoxies that bond well to 
tin-plated copper. One that I described was pull-tested to 18 lbs before it 
pulled the foil away from the PWB. On the side where the same epoxy was 
used to bond the plated foil to the PWB, parts of the FR-4 substrate came up 
with it.
Of course, this has to be done after reflow.

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