What sort of outgassing might the adhesive or label itself do? IIRC, these use a rather flexible plastic tape, and we all know the problem with what makes plastic "flexible"....
I fear not! Look at how the coin is in there, AirTite and then a 2x2. If there's any "outgassing" or other chemical reaction it would be minuscule and it's certainly not going to affect my coin.
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