I paint a lot of blades for salmon spinners.
Here's how I do it.
1. Remove lacquer from blades if necessary.
2. Lightly scuff the surface to be painted.
3. Spray 2-3 light coats of white Createx (if needed).
4. Spray additional Createx colors to get desired effect. I try and spray when it's a bit warmer since I spray in the garage. I hit the blades with a heat gun on low for a few seconds between coats.
5. After the blade is painted I bake them in the oven at 175 for an hour or so.
6. Apply top coat. I'm using D2T thinned out with denatured alcohol. I looked long and hard for a top coat. It boiled down between a auto clear coat or the Devcon. The auto clear coat would spray fine through a airbrush but it's a toxic substance. It's also quite expensive.BTW, I built racks to hold the blades while I paint them. Here's a picture of the racks and some of the blades I've painted.