You can use this for the rust...
http://www.por15.co.nz/POR15Prod/motorcyclekit.htm
It's a special kit made for fixing up rusted tanks... It is a 3 step system where you first clean it(Get the rust flakes out), de-rust it and then seal it.
You can also order online if you want.(They have a list of distributors also)
Some of the other amazing things they sell is a paint you can use for your frame or chassis. The paint is so chip resistant you can even hit it with a hammer to test it.
They also stock a range of proper engine enamels...
Good luck with the tank.
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