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i would avoid nail polish, but rather consult an art equipment store and explain the purpose of the sealant, and possibly find something that is reversible. that said, i would not alter labels at all...

i see. then it's just to lacquer away :)

i don't really understand how lacquering a label will "preserve" it; lacquering or coating labels or artwork on paper will ruin it and make it worthless from a conservators viewpoint; to preserve...