I'd say it was pretty safe since blue tack is pretty much an insulator - well non-metallic substances tend to be. Besides, there shouldn't be any current flowing through it anyway unless you've stuck both the ground and live wires with it (even then its resistance would be too high for any dangerous current to flow through it).
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Too set in his ways to ever relate
If he could set that aside, there'd be heaven to pay
But weathered and aged, time swept him to grave
Love conquers all? Damn, I'd say that area's gray
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