I seem to  recall numerous industry articles (Pauls, Keeping, etc.)  referencing  that  ideally the surface energy of  a PCBA should be >~ 40 dyne cm  prior to coating. 
I have searched my files but cannot seem to find any of  them now. Only some referencing the need   to consider surface energy. 

Does someone have any  that reference " >~ 40 dyne cm  prior to coating"  readily available  that they can forward to me? 

Thanks 

Rich  Kraszewski 
Senior Staff Process Engineer
Plexus Engineering Solutions 


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