I would recommend that you get hold of either the final copy (soon to be
released) or a interim copy of IPC-4761 Guidelines for Via Protection.
It will provide guidance for when this is necessary and which type is best
for your needs.
We are trying to get away from a "coating" of LPI being considered via
protection. There are occasions where this might be ok, but more than likely not.
Susan Mansilla
Robisan Lab
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