Connie,
your plating situation will depend on the actual circuit
layout and density
on your pwb. If you have many isolated traces, then you
will have difficulty
with over plating. You may want to try sheilding of the
anodes(to redirect
some of the current), reduce your cathode current density,
increase acid
concentration, reduce copper concentration, reduce anode
area, and/or try
pulse plating.
Good luck
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