Treating inside loose front frame rail by pourable coating?

[68_661charger]

Im replacing the front drivers rail on my 68 Charger with another used rail. Im going to soak the rail in cleaner then evaporust. Im kinda thinking I want to just pour a looser coating in the rail standing on end and move it around to get the coating past all the internal chambers in the rail. My undercoating gun wont reach through the boxed parts of the rail. What primer or paint would be good enough? Rustoleum primer and paint?
Is epoxy pourable?
Rust bullet or POR type product?
Thanks in advance.

 

[Sahara]

I’ve had far better luck with Rustoleum primer then POR.

 

[1968rt]

I used this on mine. Worked great and you can get all the way in. Eastwood Internal Frame Coating 14 oz Aerosol

 

[slimt]

You can finish off the exterior areas and get those looking good , then spray wax the insides , they do have long tubes for the gun for getting in tough areas. Spray wax or what ever you use will still collect dirt. But prevent moisture from seeping

 

[gkent]

Eastwood internal frame coating.

 

[4406bbl]

3m cavity wax 08852