Wow. Those are way crustier than any of my sets. Was the hypersilver paint lighter or darker than the as cast portions after cleaning? If I understand you correctly, you left the acid on for a couple of days, painted the entire wheel, powder coated the entire wheel, and then machined the lips and fins? Did you put anything over the machined portions afterwards? Thanks for the info.
EDIT - I see you mentioned you machined them before powder coating them. The second picture in your original post looks like you PC'd them before machining.