If you crown dip/spray paint your shaft, shaft material is irrelevant. You need a glue to stick to the paint. If you don't, why not? If you're making arrows, make them pretty. That said, I like fletch tape with a drop of glue on each end also. Fletch-tite has never failed me, though I do rebuild my arrows after about two years worth of shooting. This process let's you make arrows without waiting for glue to dry using just a single fletching jig. (In my case a Bitz, and one Bitz is a lot cheaper than six!)