There are sandpaper scratches on brake rotors.?

Update: I recently changed the brake pads for my car, even though sometimes when braking they make some squealing sound. I took my car to the shop where I got my brake pads changed and they told me they could sand both the pads and the rotors. Which they did. However, the rotor has visible scratches from the sandpaper... show more I recently changed the brake pads for my car, even though sometimes when braking they make some squealing sound. I took my car to the shop where I got my brake pads changed and they told me they could sand both the pads and the rotors. Which they did. However, the rotor has visible scratches from the sandpaper used. I want to know if these will fade away, if I need to take my rotors to resurface or if I need to change the rotors.
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