I just use plain old simple duct tape. I found that a single layer is more than enough even with my medium aluminum oxide abrasive. Just use an exacto knife to cut out the pattern you want.
The good thing is that duct tape can be peeled off and applied again if you mess up. I knw that electrical tape does not stick that good once it is peeled off.
I've been recently researching a "liquid" mask both for sandblasting and powder coating (able to withstand 400°F). If anybody knows of such a mask please let me know.
etyrrany
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