Hi there, don’t know if it could still be useful, but I kinda had the same problem and I managed to “sort it out”.
I’ve noticed that every time I banged the watch somewhere the space grey anodised coating wasn’t coming off as it is surprisingly sturdy, unless the Watch was taking the hit on that little corner where the body from rounded becomes flat, that little edge where the screen sits.
That’s the only spot on which the anodising was giving up showing the raw silver alluminium underneath.
That’s because the anodised coating struggles on being as thick when the area it sits on is really sharp, like on that angle in between rounded and flat.
That’s the origin of the problem that the iPhone 5 had for example, and that’s just how anodising performs.
I tried to cover those microscuffs with markers of different kind but there’s no paint that holds on metal, which end up being rubbed on clothes or touched with greasy hands for the whole day (seems stupid but the grease of your hands acts as a solvent melting the paint), and after a couple of days the paint was coming off.
I decided to go hardcore, and chamfer that little edge so that’d be permanently silver without any coating that could chip, giving a uniform, smooth look, without interruption of the colour.
I find the result to be very subtle, makes the watch look almost more elegant as the lip now shines like stainless steel, and permanently solves the problem.
That’s how I did it:
For lack of needle file I used a pointy knife which I held as a pen on the tip of the blade and a lot of patience and attention, then once the colour was off I kept on doing the same with another pointy knife with a ceramic blade, then once all the colour was off I kept on sliding really gently the corner of that piece of metal you see in the pic below over the polished surface to smoothen it even further as there were still little signs of the two blades I used before. That piece of metal not being nowhere as sharp as a blade worked as a treat in smoothening and flattening the surface giving it a uniform and not dented look. To follow a perfectly straight line I did all of this just sliding whatever “tool” I used leaning on the glass
I beared in mind that metal of the “tools” I used would scratch the aluminium (which I wanted) but not the glass, therefore I could lean against the glass with no problem.
I guess with a needle file you could get to this result easier but I didn’t have any of those laying around and sandpaper couldn’t be used as it would scratch the glass.
Still not sure about the needle file though as I wouldn’t know if it would be made of metal or infused with some sort of mineral stronger than the glass, so I’d advice to double check that before going that way.
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