Why paint it? The naked screen should be adequate to smooth the air flow, while allowing the exhaust system to vent heat. And, aluminum screen being about the world's best heat conductor, it will dissipate heat from any contact with mufflers, etc..
Or, you could use Coroplast along both sides, with aluminum screen just to cover the central tunnel and exhaust pipes/mufflers. The Coroplast could act to clamp the screen in place, nice and taught.
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