Third primer/filler coat applied, about half way through sanding. Two more hours to go.
Once I finish sanding, I'll assess if a forth primer/filler coat is necessary, right now my guess is the forth coat will have to happen, but for sure that will complete the primer coats.
Ignore the cracked look at the seams. I have not smoothed those out yet. Also, as you are looking at it, you will see some bumps, that is most-likely wet-sanding debris as it doesn't need a full clean until I am ready to apply the next coat.
You can see some very minor pits and defects. Either the sanding (and possibly forth coat) will clean all that up. Keep in mind this will be as smooth as the finish on a car when I am done.