Hello everyone, I was trying to spot sand some rust spots out of my 1950 cab roof and it has now become almost the entire roof. I sanded all the way to 36 grit but as you seen in the pictures this is what I am left with. My question is that black stuff I am seeing is it rust? I cant seem to get it to sand out. You can see the scratches from the sanding but I am not sure if this is just pitting in the original metal and it would be fine to leave or not. Any advice on how to remove or is it ok to leave? Thank you!
