I have been silk screening mine.  That is the ultimate quality, but not the
easiest to do if you don't have the experience and equipment.

I have an inkjet printer that I have been planning on modifying to move the
printer head over a work holding fixture instead of moving the paper under the
head.  That way you position whatever you want under the head and print
directly on it.  Most likely you would need to experiment with different inks
to work on different surfaces.  Has anyone else tried this?

Barry Gershenfeld wrote:

> >I want the user know the function of each switch such as "POWER", "RESET",
> >etc., of my circuit. So I need to print some words on the surface of the
> >enclosure box. These printed words must be non-erasable. What is the best
> >way to do?
> >John
>
> Sounds like you are using some kind of dry-transfer lettering.  What
> you can do is spray clear lacquer (sold along with other spray paint)
> over it.  Another source of clear lacquer is clear nail polish.  With
> that you have to be careful because it dissolves the print and you
> can smear it if you brush it too much.  I've used it--20 years later
> the printing is still there.
>
> Hmm, 20 years later, I hope you can still buy lacquer!
>
> Barry
>
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