Slot Mag Question

My centerlines I use a 1000 grit scotch pad and soapy water. If they are badly pitted you can wet sand with 220,320,400,600,1000 grit then scotch pad. (lot of work).You may not have to go so course as 220 grit depending how bad they are. My centerlines I used 600 then 1000 grit pad because they were decent. Post#5 may be the answer then work them from there. I have never tried that.