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Thanks for sharing your experience with the group. I don't have a bottle
of the acryllic poster paint but my wife informs me it is common enough
and easy to get.  I plan to begin my search a little later this PM for
some.  Another suggestion posted uses waterproof India ink and I may
have a bottle but it doesn't explicitly label it as waterproof.  I have
a laundry marker pen and a Sharpie to also try.  I vaguely recall
someone telling me years ago that engraved lettering/marks on metal were
often filled with jeweler's rouge and sometime sealed with a clear coat
of something.  I have a few ounces of rouge but the pale green color
rules it out since black is needed.

I have constructed some simple test strips (water resistant paper) which
will be soaked in a water bath for a minute (ummm, maybe a NY minute) to
see what happens.  The test strips will first dry for at least 24 hours
before immersion.

Frank J.
Rochester, NJ

On 3/2/2010 1:07 AM, Bill Morris wrote:
> Frank,
>
> When restoring micrometer sextant scales, I scrape out the old paint
> with a scriber under magnification of about x 7 to aid my aging eyes. I
> then fill in the graduations with acryllic poster paint and almost
> immediately wipe it off again with a barely-damp cloth. For small areas,
> just licking the cloth is enough. The poster paint is very quick-drying
> and it takes very little practice to find out what "almost immediately"
> means for a particular paint. If you get it wrong and the paint doesn't
> wipe off the face of the instrument, simply use a wetter cloth and wipe
> harder. Once dry, it is reasonably waterproof.
>
> Bill Morris
> Pukenui
> New Zealand
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