Normally, when you paint a radiator the paint doesnt penetrate deep into the core. The inside of the core is what cools the water. If you look inside a standard heatercore you wil notice that there are actually thousands of pins that go between the tubes rather than a zig-zag sheet of copper. This increases surface area and turbulence in the rad. So basically, painting the outside will have very little to do with temps.
Powder coating, however, completely covers the entire area, correct? This would be bad.
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