jamesjstar - Your paint is looking great. You do need to sand new urethane parts though. Red Scotch-Brite pads work well for that application, and you can use them wet or dry. Also, to remove silicone mold release agents, there is a product called Polycracker that works better than anything else I've used. Autobody supply stores should stock it.

The good news is that a high pressure washing should remove the paint that's still on there. Then you're not far from a great end result.