That's why I leave the fancy prop work to the pro's. I've got one buddy here in town that has the equipment to do all of the work so I let him do my props. It can get expensive buying the tools to do it correctly.
Polishing is subjective. Why put a lot of hard work into making a boat look good then having an ugly prop on the back? Those that are seeking every 1/10 MPH out of their boats leave them rough but I like the polished look. Besides that, it's about the only thing I can get my kid to do on the boats!