Some guide coat. For those that don't know what guide coat is, I'll take a second to explain it. It's a super useful technique which can tell you exactly what is wrong with a panel.
1.) Using flat spray paint (in a contrasting color to the primer/panel you're sanding)
2.) LIGHTLY spray the panel, so it looks like someone sprinkled pepper all over the panel. Not too much, as this will cause needless sanding, and will inevitably gum up the sandpaper faster.
3.) Using a block, sand the work area. Wherever there is still black (or whatever color) spraypaint, you have a low spot, or some problem in that area.
So that's what I did before I came in to eat. Guide coat applied, ready to sand upon my return to the garage after I grill up some steaks.


