I‘m doing this a little bit different…
After cleaning and polishing i activate the stainless steel, than i do a 24kt hard gold plating first to get a perfect finish and to get a strong, scratch-resitant platinum layer afterwards. Than i do the platinum plating. At least i put it in a special solution bath to remove any oxidations on the surface and to get bright and shiny result without any stains. A little hand polishing with microfiber cloth and thats it.
…of course after each step you have to flush the item with destilled water…
And i do it with a pen/tampon galvanic system and not in an electroplating bath because you don‘t reach between the links of the strap very well if you do it by bath