I've made thousands myself. Never tinned them, never will.
Rick

"Alan B. Pearce" wrote:

> >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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