One of the guys in our area filled his UC tanks with pea gravel, and strapped the tanks to his tractor tires. A day out in the field shot peened the inside beutifully.
If you take them to a rad shop, they will acid wash the tank and then coat them inside with a rubber type coating. I don't know if they have improved this coating in the last 15 years, but the older stuff you had to be careful not to use alcohol in your fuel or the coating would disentigrate and plug your fuel lines.
A rusty tank will continually give you problems, and embarass you on parades and mobile displays. Good to see you being proactive on this.
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