|Hard to tell right away....|
|Re: Will work on glass but with unknown results on coatings -- Rosanna||Post Reply||Edit||Forum||Where am I?|
I had to restring some customers' necklaces for years after.
So even if you etch them, there's no guarantee the coating won't fail later.
I would imagine tumbling would simply remove the surface of the coating and make it even more vulnerable to peeling/chipping off.