Thanks HarryV. I've seen ads about those but never used them. I
understand they are aluminum anodized panels with mechanically/CNC
engraved lettering and holes. Has anyone used these? In a Marine
environment?

I've used them at work many times - very nice product and fast
delivery.

Peter etal, Are the 'filled colored' letters epoxy??

So if the 'fill' was not perfect, we'd have an exposed edge of
recently-milled aluminum with an epoxy fill on it, is this true??

Anyone have an idea of how that would hold up in salt-spray??

If it was anodized AFTER milling it would probably be fine....

On the other hand, 'raw' aluminum lettering milled into a darked
anodized aluminum plate would probably stand up pretty well, right??

I guess I'll ask the vendor(s) about use of this panel technology in
Salt Spray.

This DOES make me think that the engraved laminated plastic panels
(with a metal backing for strength) may be the best long-term
solution.

Meanwhile, anybody into the Electronics part???