[log in to unmask] wrote:
>
> Among the ways of sealing vias on LPI solder masked boards are a)  filling
> the vias with LPI, and b) tenting the vias with dry film solder mask.
>
> We are on the brink of converting from dry film to LPI on all our PCB's.  I
> would appreciate any comments on the relative merits/demerits of boards
> produced by these two processes.  Our supplier recommends the dry film
> option.
>
> Our boards are sometimes in relatively harsh environments and are designed
> to operate from -40 C to +70 C.
>
> Thanks to those of you who responded to my inquiry on how to repair
> urethane conformally coated boards which have been contaminated with
> silicone prior to conformal coating.
>
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     Have you looked into Taiyo LPI. We use a Taiyo LPI and plug the
vias with a Lackwerke Peters hole plug. Great processing latitude on the
Taiyo and we haven't had any issues with the hole plug...been doing it
for quite a while now.

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