Coating a piece of metal isn't just a case of spraying some paint on it and calling it a day. Get it right, and you end up with a finish that looks good and holds up for years. Get any stage wrong, ...
Hemmings on MSN
Painting an engine with POR-15 engine enamel
These days, most OEM engines are left unpainted, just the raw aluminum left to oxidize and get covered in that white powder.
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