Good Rust Treatment on the Cheap???

[Cobalt 60]

Naval jelly

 

[slacker1972]

I have had good luck with naval jelly

 

[letusbuyyourcar]

Okay so the majority reply is for Naval jelly. All I gotta do is treat the rust so I can patch the holes and then cover it with a gallon of truck bed liner. It aint gotta be pretty, just permanent.