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In article writes:

Thing is, and this explains my post, I'm sure years ago I saw
and article or advert where you sprayed on a paint then exposed it with UV
and mask or some similar photo process. It was a front panel legending
affair. Maybe it wasn't very good or I was dreaming. Couldn't find
anything in Google.

I made some small tags with a kit from Kepco (which no longer exists,
at least under that name) which included some photo-sensitized black
anodized aluminum sheet. You exposed the areas that you wanted to
mask, then etched the anodizing off with a nasty solution that came in
the kit. Finally, you stripped off the mask and you were done. It
worked pretty well. I seem to recall that they sold the photosensitive
masking spray in an aerosol can so you could use it on a custom panel.

I have no idea if it's still available, but if you haven't been
searching for "photo sensitive resist" give that a try.

--
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