No no NO!!! Don't paint anything on the radiator!!!

Paint acts as an insulator, so you'll inhibit the heat dispersing properties of the radiator!!!

It's bad enough that these things break at the hose neck...

Paint some brake calipers...

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car