Watches? As in timepieces? Whoa man, I'd recommend you think long and hard about this, maybe seek expert opinions. Especially if you're talking about old, antique watches. Better to leave them alone, IMO.
I have a beadblaster, and would have no problem letting you use it. But it's loaded with glass beads, and I'd be afraid they'd be too abrasive for blasting watches. I personally wouldn't want to use anything rougher than fine ground walnut shells, and I'd prefer them to be old and worn out as well.
I have no idea what your plans are, but I hope you're talking about merely blasting the stripped cases. Any blasting media will f-up the innards of a watch in a second, and will destroy the glass crystal in 1.5 seconds.
I'd let you use it, but I don't want to hear you screaming "Oh Holy Mother of God" if things don't work out well! Beadblasting auto/bike/gun parts is wonderful, but very harsh on soft metals and other delicate things.






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