What if it is a APC or TT prop???
Start with the flashing. Sometimes that's all you need on a TT. Seldom so lucky with an APC, but start there.
I prefer to sand the front face of the propeller. Part of the trick is getting a feel for the grade of sandpaper to start with...and then polish with 600. With FF wings, theory was that you wanted as smooth a bottom surface as you could get, and the top would be better a little rough, for turbulation. Same thing with props, IMO.
I don't know what the glop is they "finish" Zingers with, but it clogs up the sandpaper so much that I'd rather strip it all off to begin with...with paint remover.

Steve