But I ain't perfect, give me paint and the mic and I'mma merc it
Kent Clark's within me, when I'm up he has no purpose

from Tech N9ne – Face Paint Lyrics on Rap Genius

Meaning

techs not flawless but when hes rapping wiht his face paint hes close too it as possible
Superman is apart of him and when hes going he doesnt even need him.

He’s talking about his other identity, the one who has no purpose when he’s up rapping with his face paint on, as Tech N9ne.

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