Powder paint would be your best option. If you use an electrostatic applicator you can get a nice even finish that's tough and looks great. You can also get a airbrush that sprays powder paint and use it but you'll waste a lot of paint.
I used to paint large blades for salmon fishing. I used an airbrush and paints, then used D2T thinned out and painted over as a top coat. Worked very well on the larger blades.
Since the salmon blades were multicolored it was the best option. If I only wanted a single color powder paint would have been the way to go.
If using a electrostatic gun you can lay down a base coat then use one of the many clear/candy top coats for some really neat effects.
This Veteran heavily medicated for your safety. Keep me fishing and all will be well.