Its hard to make it look like new unless you have it all redone. But you can get enamel repair kit from diy shops to fill in the chip. I havent used them so not sure how effective they are
Many radiators are factory-painted using a 'powder-coating' process. If you look at some manufacturers' get-outs and exceptions, they say that radiators should be painted again after installation to avoid rust spots, etc..
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