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Nail polish works well for muratic acid. I've used it a few times and worked two out of three times. The reason it didn't work the first time is because I put it on in one thick coat. Someone, Geno I think, recommended using several thin coats and has worked well the other times.
You might want to also check out the Fine Embellishment forum as they had a discussion a little while back on resists for etching scenes into blades.
Hope this helps,
Jim
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