>I never saw the need to electroless tin plate pcb's. It's
>an added step with messier chemicals. Most boards won't
>tarnish like a copper penny. I have boards in working equipment
>for over 15 years and they still look as shiny as the day I
>made them.

Did you etch these yourself or commercially made. Commercial manufacturers
are likely to spray them with a plastic spray to stop tarnishing if there is
no tinning in my experience.

If you etch boards yourself it can be worth doing this also with a flat
matte finish plastic. This can be readily soldered through, just watch the
fumes, which you should be doing anyway. Some people spray with this after
the solder/clean cycle as well, can be worth doing in a high humidity
climate.

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