In my other thread "are these blisters" I have learned that my skeg shoe is rusting. I need to get the rust off before I paint. I am a metal worker and used to using a metowbo or 6 inch grinder with various grinding wheels. I was thinking of using it with those sandpaper "flap" discs but it is high speed and dont want to dig into any fiberglass. What would the prefered tool be for this. I dont mind buying a good tool and hopefully be able to use it on other projects. thanks for any advice.