interior unibody frame rail rust elimination? -
  • 1 Post By pat master
LinkBack Thread Tools
post #1 of 4 Old 06-16-2021, 08:17 PM Thread Starter
Registered User
2002 WJ 
Join Date: Nov 2016
Location: Madrid, NY
Posts: 955
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:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Member of Fourth Coast Jeeps
Ravenbar is offline  
Sponsored Links
post #2 of 4 Old 06-19-2021, 09:00 AM
Registered User
Join Date: Sep 2018
Posts: 739
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.
V8GCZJ is offline  
post #3 of 4 Old 06-20-2021, 02:06 PM
pat master
Registered User
Join Date: May 2019
Location: West Milford
Posts: 55
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.
pat master is offline  
post #4 of 4 Old 06-20-2021, 02:14 PM
pat master
Registered User
Join Date: May 2019
Location: West Milford
Posts: 55
This is most recent test I performed . You can do this at home
Ravenbar likes this.
pat master is offline  

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome