Re: Rust inside the tank
nope. using phosphoric acid will kill the rust. it's people who do half arsed jobs and expect miracles who get rusty tanks afterwords that complain. remember what you are putting in the tank afterwords... ermm petrol, petrol does not cause things to rust its the water that can come with the petrol that causes the rust.
dont use sealants they also lock rust in as well as keep it out so end up rusting to the front surface, if a tank is that far gone then just get another tank. only classic tanks that are hard to get need serious work and usually involve getting the plasma cutter out.
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