I have an iron horse mountain bike I think the frame and wheels are powder coated i know the frame is aluminum. The frame has some scratches in it. The stickers are next to impossible to get off. I can feel the edges but they just will not peel up. I am thinking they will need to be sanded off. The scratches should probable be sanded as smooth as possible. After this is I do not know what to do or what type of primer or paint to use?