What will be your approach to address the rust in the tank? I am about to tackle this on my SS tank.
Well... less is more in this case. For the record, I have never seen anything good happen with coating a tank, so avoid going down that road.
Luckily this one's so clean that it doesn't need a serious acid treatment ...all it needs is a very light treatment. Probably just use a vinegar soak and then a well cushioned tumble in the dryer with some BBs.
I did a VNB tank that was worse. I used navel jelly (phosphric acid), water and black rocks. After shaking and draining the acid wash, I used degreaser, blackrock, and water. Dry immediately with a hair dryer or heat gun and then tumbled with more blackrocks in the dryer (wrapped in towels, no heat, wife gone for the day). then rinse with degreaser again, dry, and a quick coating of oil and gas to prevent flash rusting.