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Old 09-11-2019, 01:09 AM
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Looking for advice on rust repair patch prep

Hello All.
I have to replace a rusted out center body mount on my kids 2000 TJ. I purchased the 13" Rust repair patch.

https://www.rustrepairpatch.com/stor...unt_patch.html

I was wondering if there was any special preparation for the patch prior to welding it on? Any special primer or paint to use? Mainly on the inside of the patch? I will be painting the patch after its welded on. Any advice or information is greatly appreciated. Thanks.


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Old 09-11-2019, 03:48 AM   #2
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i primer and paint the inside/underside of larger pieces b4 i weld them on. some have scoffed at this and claim it will just burn away. but the fact is, just the edges will burn away.
an 1"-1.5" will burn or melt away from the weld area, but most will remain. i don't care to sandwich raw untreated steel.
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Old 09-11-2019, 10:03 AM   #3
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Just mentioning, but......if I'm going to patch it, I'd start just after the front lower trailing arm mount all the way back to just after the rear trailing arm mount. Auto rust has that piece listed on their site and the workmanship is very good (going to do the drivers side in the near future).
Once you cut out the old section, leaving plenty of material for over lap (fish plating as they call it), test fit to establish your grinding line, grinding down to clean shiny metal, hitting it with welding primer and reattach as required after you have spot welded the piece to hold it in place.
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Old 09-11-2019, 03:36 PM   #4
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i think he's doin the body channel not the frame rail, yes? if your doing frame that's the wrong piece...that looks like a chunk of the tub support channel to me.

i'd cut out what nasty you can and clean the rest as best your able to. then prime n paint whatever your never gonna be able to reach once it's placed and welded. don't weld through the paint, clean it off or tape off the weld area b4 spraying.
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Old 09-12-2019, 12:13 AM
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Quote:
Originally Posted by daveTJ04 View Post
i think he's doin the body channel not the frame rail, yes? if your doing frame that's the wrong piece...that looks like a chunk of the tub support channel to me.

i'd cut out what nasty you can and clean the rest as best your able to. then prime n paint whatever your never gonna be able to reach once it's placed and welded. don't weld through the paint, clean it off or tape off the weld area b4 spraying.
Correct! Its the body mount not the frame rail. I was going to mask off the edges on the patch where it will be welded on. Leaving bare metal. Thanks for the information.
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