Ned,

I made vanes for a DoAll bandsaw blower from canvas phenolic material.
There were 4 vanes about 2'x2' My stock machined rough and fuzzy
so I made the vanes a little oversized and lapped them dry with fine
wet
or dry paper on a flat surface. I got a nice close fit in the rotor
slots
and the vanes turned out dark and shiny. They worked fine.

Your 6 vanes are bigger so it would be more work but it can be done.

Regards, Charlie