Search:

Just to clarify I am talking about wet-r-dry sandpaper the black stuff....

Just about any automotive place should have a penetrating oil, something that is sprayed on rusted bolts to loosen them...

Try using a rust cutting oil when sanding, I sand dry, then spray some WD-40 on there, this creates a slurry just like when honing, which seems to get inside the pits way better.....