Sanding the surface of new rotors is a long time practice. Not saying it's needed, but it commonly done. I do it.
A new rotor, OTOH, should have only fresh metal. No rust.
Talk to them.
Steve
98 Contour SE Sport 2.5 Duratec ATX The wifey's car
89 Taurus SHO - 246K miles
94 SHO ATX - 190K
1997 F-150 5.4L ATX - The Workhorse 150K.
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