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Careful, water vapor can adsorb on the interior surfaces of empty cans. Baking the EMPTY cans at 250°F will remove this water. Most metals and metal oxides have strong water attraction. Even glass has this property. Splitting a gallon is good if done carefully. POR welds used cans shut...

POR cures from exposure to humidity. It has a high surface tenacity and creeps behind the rust. Where it finds water, binds it and then cures. If you get the smallest bit of water in the can, it will set fast. Fuel and oil won't touch it, UV degrades it fast so top coat once cured.

Lap seams can trap moisture, causing accelerated rusting. If you must lap, be sure to seal it well on the inside. I match cut, fit up for minimum gap and use short interrupted back stitch welds. Take time to avoid heat buildup. And practice on scraps to adjust settings for full penetration

Prep n Etch , a brand of phosphoric acid, from a pump up sprayer. Let it work until almost dry, then pressure wash. Repeat until bare. It is a good fertilizer so don't worry. Once clean, then POR over the flash rust..roller or brush. Top coat with frame paint. This cleans off the grease...