Frame rails with surface rust: Epoxy primer vs cavity wax vs frame coating

95maxrider

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For a DIYer in a home garage, what is the best way to slow down rust and protect the inside/blind areas of frame rails and rocker panels if they have existing mild surface rust?

I'm in the middle of a mini-restoration of my 1996 Infiniti I30, and I have used two different products recently in my quest to keep the car alive for another 25 years.

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I first started working in my rocker panels. They're generally in good condition, but there was some surface rust on the insides of them. At the time, the only product I was aware of for this application was 3M Cavity Wax Plus, so I liberally coated them internally with the wax.

(Picture is from my boroscope)

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I then learned about Eastwood Internal Frame Coating. It sounded even better than the wax since it had stuff in it to supposedly neutralize existing rust. So I used that on the inside of my unibody "frame rails" in the rear of the car.

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The projects are done now, but I'm wondering if I should have approached them differently? I have other cars in similar condition that I would like to preserve, so I would like to learn the best practices for situations like this. What product does the best job of slowing down existing mild rust in internal cavities? Cavity wax, Internal Frame Coating, or epoxy primer? Something else? Frame coating followed by wax?

Thanks!
 
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