I actually like the back side of the blade to stay the blade color. Now I do paint the front of them by tapping the paint on. That nickle, brass or copper flash every other spin I think helps, like to think the fish see it as another fish chasing it. Plus with paint both sides it does change the weight of it. If you powder paint them you don't have to rough them up they powder just fine.
Here's a couple with the front side painted
Here's how I bend the spinner wire to hold the blades - and the curing tray with the wire through and the blades ready for curing. Cure time is the same as jigs