i don't know what the fuchs are made of steel or aluminum, but now that you've got them polished like that keeping them that way won't be to hard, i use a product called Rolite on the propeller for my dad's airplane, if you keep it dry the shine lasts indefinitely, you can find Rolite at
www.aircraftspruce.com, when a clear coat starts to chip off you'll be kicking yourself, hope this helps