interior unibody frame rail rust elimination? - JeepForum.com
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post #1 of 4 Old 06-16-2021, 08:17 PM Thread Starter
Ravenbar
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2002 WJ 
 
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interior unibody frame rail rust elimination?

My WJ has a lot of rust in the rockers and in webs between the rockers and unibody framrerails(at the rear LCA mounts), just in front of the rear tires. WJ's are known to rot out at the rear LCA mo9unts

A couple weeks ago, I cut out the remnants of the worst web, in preparation of replacing the rockers with ROCKer sliders, and the webs with custom parts. I found a couple pinholes in the unibody framerail just above the rear LCA mount on the drivers side. I broke out the welder and plated over it with some 14ga, for the time being, as it's my daily driver.

This past weekend, I opened up the floorboard above the area with the pinholes, and found a decent amount of scaly rust inside. I'm looking to mechanical remove then chemically eliminate the rust, through a few strategically placed holes in the floorboards.


I've got IRO center section(3/176") frame, and Trail Forged rear primary stiffeners(1/8") on order. That leaves a 18"-2' section, where the rotted out web blocks access to the "frame rail". I'll plate the section interior to the web in 1/8" plate.

My ultimate plan is to mechanically remove and chemically neutralize as much rust inside the frame rails as possible. Then paint/rust preventative on top of the treatment. Exterior replace any lost strength.

MY only question is what to use to treat the rust interior to the frame rails.
Foremost thought is Rustmort, although I havent found a local supplier, followed by some sort of paint and frame wax.


Project Thumper:

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post #2 of 4 Old 06-19-2021, 09:00 AM
V8GCZJ
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Rustmort is made by SEM, You will need to fine a local paint shop that carries SEM products. There is also 3M witch also makes similar products. A local paint shop is you best bet. If you clean down to bare metal use a good epoxy primer on top of it.
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post #3 of 4 Old 06-20-2021, 02:06 PM
pat master
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Your plan is sound. Removing rust mechanically or with phosphoric acid is your ground work. Once you have things cleaned up apply two coats of the Permanent rust sealer, non leafing aluminum variety. Apply at least two coats then primer and paint. Rust removers are like paint remover if they're wet they're working. Invest in an engine cleaning gun from Harbor Freight spray the inside of your channels and Rockers with your acid after its thoroughly dry spray in 2/3 coats of the permanent rust sealer and come around to the outside do the same thing and then your primer and paint . This is more effective than cavity wax.
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post #4 of 4 Old 06-20-2021, 02:14 PM
pat master
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This is most recent test I performed . You can do this at home
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