Good old Krylon. Mine's stripped too. Last night I was cleaning the castings and found that carb cleaner does a really good job of stripping the factory paint although I don't think I'd use it with the spindle and bearings still in place. I've found body filler as well. When I get to the point of paint, I'll fill the casting defects with quality automotive putty, prime and paint, probably with Krylon. A couple of clearcoats too. I've yet to decide on a color.
The factory paints the spindle housing with the spindle in place. I haven't decided yet if I will paint and install the spindle or install the spindle and then paint. Probably the latter.