OK, being the perfectionist I am I wasn't satisfied with the way the reproduction wheel came out. Since it is a harder urethane material, the Plasti-Dip spray nicked rather easily and didn't adhere as well as I would have hoped. When I picked at it a little, the entire coating peeled off in one piece. That, of course, meant that I did not prep the repro wheel well enough.
I also wasn't satisfied with the fact that it still had a bunch of grain along with a fake outer seam that marred the surface. So I ended up hand-sanding it with 80 grit, then 200, then 400 then 600 until it became as smooth as the factory wheel. I was very careful to keep away from the fake threads along the inner seams. I then sprayed it with a flexible plastic primer and sanded that with 600, reprimed and resanded by hand until it was shiny and smooth. I also reshaped the edges where the urethane meets the spokes as the repro was a bit too angular in that area. Once I was satisfied, (I know, I've said that before) I sprayed the wheel in numerous heavy coats of the SEM Landau Black and the result was beautiful. SEM is the coating to use and it is great stuff, much better than Duplicolor or VHT or any of the other brands. Other than the black anodizing looking way too new, the wheel looks like an NOS wheel now. And it feels a lot better as well. I will be installing this one in the car and saving the original wheel for posterity.
