Getting my firewall prepped for paint. Last night I removed the wiper motor, column, and booster. Tonight I hope to remove the heater box and blower motor. My plan is to hit it with my electric dual action sander with some 150'ish grit to get it down to bare metal. I plan to paint from the body seam lined in red here, down to the floor pans, out to the door jams on either side.
a) The green arrow on this picture shows a body hole. I assume this should have a rubber body plug in it, right? (same on the other side). I am not sure why they were be missing but they are.
b) Do you think I am OK just sanding this light surface rust off and hitting it with self etching primer, then base/clearing over it? I am not real worried about finish here since it's hidden behind the fender but I don't want it to rust, either.