My NT's doors, windows, screens are all powdercoat aluminum. As the powdercoat fails, I'll sand area smooth, prime with Pettit's EZPrime, then cover with one or 2 coats of 2-part Pettit EZ Poxy. I use Pettit's 2-part because I can get a perfect match of NT's oyster gel coat (not a pure white) with a 3 to 1 ratio of Yacht White and White Sand. A small good quality artists brush will level out quite well.
The best one-part metal paint I've found, and one that has a near perfect leveling quality is POR-15. POR-15 is a system of cleaners, primers, thinners, and paint. At the minimum, you'll need their thinner (solvent), nothing else works. Note that this paint adheres aggressively, and if spilt or splattered, would be near-impossible to clean up.
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