cloudswimmer
Quarry Creeper
Not a paint guy at all, but I’d like to paint this plastic 3D printed radiator grill to get an aluminum look, could you guys recommend me a good paint to use? Thanks "thumbsup"

Silver Tamiya TS 17 to shoot the entire radiator (I personally prime first) then a flat black wash or two to separate the screening
Wash is an acrylic thinned 10 or15 to 1 and “washed” on then it’s sealed with flat or semigloss clear after rubbing.
Hang up and Drive
The problem with spray cans is that it works coat the entire part. I have a feeling the Op only wants to cover the actual grill (probably not even the "frame" of the grill). In order to do that, to our requires hand-painting, with a fine brush.
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You can even wipe the wash with your finger or a napkin. A rag or brush may pull pigment out of the recesses.
You can even wipe the wash with your finger or a napkin. A rag or brush may pull pigment out of the recesses.
Ok so then I spray the whole thing silver and let it dry for a couple days, then take some flat black and dilute it 16 to 1 with paint thinner, then brush it on so it gets down in the ‘pores’ of the radiator, then immediately wipe the black off the top with my finger thus leaving the black underneath and the silver on top, correct? Actually I was just looking at the radiator in my real Jeep and it’s a dirty black, but I think a silver radiator would look cool behind my scale gloss black Jeep TJ grill don’t you think ? Thanks "thumbsup"
I use acrylic hobby paint (water based) for that kind of detail. Easier to wipe off/start over if you mess up.
Rustoleum metallic silver looks like aluminum when it dries. Plus it’s easy to work with and dries very fast.