You don't.
The best option is to remove all the old paint. Take a piece of sandpaper and strip all the old crap off.
Go to a local sign shop and have them make some stickers with what you want. Something like "Radar" or "Deadcat in the background", etc. I'd let them apply it to the switch so if they goof it, they can replace it.
Take it home and spray paint it flat black.
Let it sit for a few hours then remove the decals.
Under where the decals were will remain clear, while the rest of the panel will be flat black.
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