RE: props
Hi!
Of course you can sand any prop!!!! Just go ahead!
I sand my APC props ...even modify them by cutting filing and ofcourse ...sanding. I make my own carbonfiber props for pylon racing and scale ...which I naturally sand!
Always sand on the front side of the prop..the curved side pointing at you when you sit in front of the engine /airplane
So just go for it!
Regards!
Jan K