Thanks for the comments. I didn´t paint the fins, before the color I sprayed them with a coat of vaselin so the paint won´t attach. It´s just the outside.
Then it's both awesome and unimpeded. I likey! Captain Exaggeration is out in force again, I see. Allow me to elaborate: Black radiates heat better than blue. This is a radiator. Therefore, black radiators would work better than blue ones. Clearer?