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Those are fairly expensive solutions for a straight forward need. Getting an overly heavy coating on the frame will create challenges for everything mounted on it. Powder coating would seem a better alternative than the bed liner. Unless your frame has some sort of leak, I don't understand the FlexSeal part.
All I know is that these frames, unless they are in soil, are typically not rust victims. This despite little factory surface treatment.
I used Rustolium bed liner on my newly repaired floor. I spray painted it first with rustoleum primer and then brush painted on the bed liner on the top and bottom surfaces. It is very tough and I liked it for that. I don't know about for the frame though as it is bumpy and rough. I tried to use the spray bed liner and it only clogged up in the nozzle.
I used that product on the bottom of the cab after I repaired the floor. I also used it on my running boards as the stuff is tough. But I wanted a shiny frame that was easy to clean so I used Rustoleum 2X gloss black.
Needle scaled some of the frame. Need to sand yet. Frame is pitted but in good shape. Should I use a rust stopper or just a primer? I have a lot to go.
I took my frame to a local powder coating place and had it sand blasted. Then I coated it with phosphoric acid (Ospho). Once that was done, I washed it and brushed all the loose flakes off and brush painted with good old Rustoleum oil-based paint in semi-flat/gloss black. I've done several frames this way - works well and lasts reasonably well. Most importantly, it's easy to touch up and/or re-coat.
I've never used the thicker stuff, but I'd be wary of it lifting and getting moisture underneath. May be worry for nothing, but some of those thicker coatings will peel...
When I did my 56 I had it sandblasted and powdered coated. I first welded up the extra holes in it and fixed what needed to be done. It was done in a nice satin finish and was done 8-10 yrs ago. Holding up very well.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
