> Is this done with an acid protective film being placed on the
> non-recessed areas and then the surface being acid etched to
> remove part of
> the aluminum, then cleaned and painted? I've see this process on
> plane parts
> at Boeing.
I believe the originals were simply stamped. The acid process might be
easier to do at home, if you have a way to safely dispose of the chemicals
afterwards. Works for printed circuit boards anyway.
Randall
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