Hello,

 I am trying to resolve the probelm of coating seepage into connector
sockets (forbidden). While most of the cases can be due to oversight, there
are observations that PTH vias directly beneath these connectors actually
allow the coating to seep through to the other side of the board. I was
wondering how via of 0.3mm can have such impact. From the many observations,
not always do we have coating seepage over due to 0.3mm via. I was wondering
whether the coating volume concentrating at a location especially with these
vias around could be the most possible cause. If not, what could be the
likely causes.
Your expert advice would be greatly appreciated.

Thanks in advance and regards,
Wee Mei

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