well it's simple to paint the inside of it just fill the radiator up with paint then empty it . if you can fill it with water why cant you fill it with paint. i personally dont see to much difference to painting the inside or out. painting it is effectively insulating it if you insulate the out side of it or the inside of it your still putting a layer of insulation over it .ps both my black ice extreem radiators are totally painted on the out side . well that i can see. painting will effect the flow of it though .
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