Copper tape and conductive paint are tried and true.

I haven't used paint, but I can certainly see applications for it, particularly in tight spaces since it is so thin and form fitting. Also no danger of an accidental ridge causing a short.

I have not been bothered by the shine of copper or aluminum under pickups. But if I were, paint would be an elegant solution. Still, since I have already put HVAC tape in the guitar, I'd probably just put some black tape under the pickup to cut down on the glare ;-)

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