Go and buy a kreem kit from the motorcycle shop or elsewhere that you can find it and read the instructions it is pretty straight forward, there is solution in the kit that you use to paint the outside of the tank to avoid messing up your paint, and you can call kreem and ask them the removal part of it.
I have a mechanic who just called me about my tank being rust removed, and I will pick it up in the next hour, he is using electrolysis to remove the rust, this has been just over 3 weeks.
Picked up my tank and it is awesome, the tank looks almost good as new, all the rust is pretty much gone.
The prior onwer of this bike had poured muriatic acid inside and then done nothing and it was sitting in a car port rusting away for almost 30yrs when I got it.
achtung3 screwed with this post 05-03-2013 at 08:29 PM