Got a device that has lots of corners, differences in materials, etc. If I
masked it for painting, would be masking forever.

I'd like to refresh the smooth metal parts.

Are there automotive paints like Imron, Acrylic, etc that will brush on OK?
The shiny gloss would be good to have.

If worst comes to worst, I can use water based latex outdoor gloss. Would
like a higher gloss.