Rust treatment for inner frame rails

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    garth66
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    I plan to treat the insides of the boxed frame rails on my car. This is a very inaccessible area. I can insert an undercoating wand and spray material, but there’s no way to subsequently clean any prep material, so acid based products are out of the question. The steel is solid with no externally visible signs of rust, and what’s visible through a few small drain/access holes in the chassis appears to be solid with only a surface coloring of rust – the car is not driven in the rain (and hasn’t been in rain or a wet environment for at least 30 years). I just want to take any necessary steps to protect it for future generations.

    I plan to blow out as much loose dust and debris as possible with compressed air, and then spray the inner surfaces with Rust Encapsulator.
    https://www.eastwood.com/rust-solutions/treatment/rust-encapsulator-1.html

    Should I first spray Rust Converter before coating with Rust Encapsulator? Should I use Rust Converter instead?
    https://www.eastwood.com/rust-solutions/treatment/eastwood-rust-converter.html

    What are the differences between the two products and which would be best for my application. And, would using both products be redundant or overkill?

    Thanks!

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