Yes, if it is metallic paint it is possible.
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No, practically all plastic is an insulator. An insulator does not carry any electrical currents. A conductor can carry a current. "What plastics are conductive?", you may ask -- see link below.
In the electrical trade aluminum wire is equivalent to copper wire as it is also used to carry current. To carry the same current as copper wire aluminum wire is up sized to meet the same ampacity.
Yes, very easily. Copper is an excellent electrical conductor.
As with any electrical installation, the wire size used depends on the expected maximum current the wire will carry. That cannot be determined by voltage alone.
It is called electrical current.