Hi,
I've never found any paint to be worth the bother on props or shafts.
The only thing that's even worked for a little while is Lanolin grease
- like Lanocote from Forespar. Warm it up and paint it on with a brush.
There's a similiar product from NZ called Henley's Grease
http://www.bestmarineimports.com/Props.html .
I'm going to try it next year for no other reason than I gotta like a
guy who names a grease after himself.
I have no relation to either compay.
Carl