never noticed any extra heat, the coating of paint is as thin as I could make it and cover nicely, If I had to repaint, I'd strip whats there first to keep the thickness to a minimum. I used brake caliper paint instead of engine paint because it has a higher heat resistance rating. Fan kicks in the same as before, and I've still not ever had the temp light come on. (as a warning...it tests fine when you turn on the ignition)
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