RE: Painting a spinner
Ken, I don't have any problems with using an electric starter on painted spinners, probably because my starter has a big soft silicone cup (from Miller's products) that doesn't leave a ring on the spinner. In fact, my painted P-40 spinner has at least 400 flights on it.
I used all types of paint, from latex to Testors acrylics to Lustrekote. They all work pretty well. Latex and Testors acrylics require a top coat, such as LustreKote clear. I tried fusion paint on a nylon prop, and it chipped. I have never tried it on a spinner though.