Best spraypaint?

it's all well and good suggesting powder coating and proper spray kits, but in fact a spray can from a motor factors is perfect.
It's the prep work and conditions you spray in that are way more important than the equipment

Yep. I briefly worked as a painter's assistant and he said the same thing. You can blow the paint out of a bicycle pump and get a professional finish so long as you prep correctly and do a hell of a lot of wetsanding. I have even painted a bike with a roller and it was better than a lot of factory jobs.

Rattle cans will never be as durable as 2-pack acrylic, powdercoat or stove-enamel, though.