Brian had it pretty well covered there.
I used mild steel, all lightly grit blasted to remove scale. No coating inside, all fittings were sockets welded to tank. I coated the tanks with tar epoxy and then enamel paint as top coat. ( not looked on as the best top coat (fire risk) but 22 years down the track I have no complaints. Just ensure that all deck fittings are tight and no moisture gets onto tank tops and the tanks are ventilated all round.
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"When I die I hope my wife doesn't sell my toys for what I told her I paid for them"
Money: It's made round to go round , not flat to stack.
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