I've been slowly making progress on my gas tank. After sealing the inside, I got to work on surface prep for paint.
I used Dupli-Color Grease & Wax Remover first. Once dry, I used wire to suspend the tank from the ceiling over an old flannel sheet I use to protect my garage floor from overspray. I also covered the openings on the tank with tape.
I applied a few coats of Dupli-Color Self-Etching Primer. It's a dark green.
After that, I used Dupli-Color Filler Primer, which is a light gray. It's a high build primer so it helped fill in light scratches and imperfections quite well.
The weld around the gas cap bung bothered me as it was a high ridge. The gas cap that comes with the tank is a pop-up so it will not cover this area.
I decided to Bondo it with the goal of making it smooth.
It took quite a few rounds of sand, apply heavy coats of filler primer, sand, apply heavy coats of filler primer, sand, etc.
The last pic above was close to done but not quite. I was nervous at first (not surprising how sloppy it looked when I started) but I was really happy with the end result.