Since you're making only one, use a drawing program to create an
overlay. Any of them will let you choose fonts and letter size, and the
better ones will wrap text along a circle or arc. Add color around
groups of buttons or to highlight certain functions. Make test prints on
paper or transparency film until you get what you want and the spacing
is correct. Take your file (PDF format is best) to any prepress or print
shop and have it output on polyester label stock (might want to make two
or three for spares). Top coat the finished label with Krylon clear
spray to protect the toner. Carefully align and stick it on the metal
panel, cut out the holes with an X-acto knife, and you're done.

Karl Townsend wrote:
I've canalized an old CNC control and built a new operator's CNC control
panel. It has several push buttons, toggles switches and selector knobs. I'd
like to do a professional job labeling these. The print has to be different
sizes and some of it has to follow a circle around a knob. FWIW, everything
is mounted on a sheet of 304 SS.

Is there any way to lay this all out in some pc program and print it to
something that can be transferred to the sheet metal? Which programs,
materials etc.?

Karl