I used to make "etched" mirrors and glass partitions way back when and used contact paper to mask off areas I didn't want blasted. The stuff is pretty thick, easy to cut with a razor blade and holds up well to the abrasives (as long as you don't go with a seriously aggressive media) It's sticky backed so you peel the backing and burnish it down good to get all the air bubbles out and ensure good contact.
I used to get the stuff at a local Art supply store.. I don't recall who it was made by...
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