Be careful tho, I dont think you’ll get gold plated on any of these watches !

The PRX is a PVD yellow gold finish but does not contain any gold what so ever. Pretty sure it’s the same for the Seiko. I’m afraid the end result will not have a jewelry look that you seem to be after. Also note that the PVD is only coated and can result with some pretty choppy patina.

With that in mind I would probably steer my choice towards stainless steel options tho I’m not expert enough to recommend any interesting options.

Spray paint bubbles is crazy