Have you found a paint that protects the propeller for a season? Most paint doesn't adhere to the prop blades long enough to provide much protection if the boat is driven under power for any length of time. I've pretty much given up and just clean and polish out of the water once a season. I've tried one or two paints that claim to protect a propeller, but ended up being more advertising hype than benefit.
I'd be interested to hear if you have found better results.