Rust Blast or Chem removal? -
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post #1 of 4 Old 04-28-2021, 09:34 AM Thread Starter
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1985 CJ7 
Join Date: Mar 2021
Location: Kinston
Posts: 20
Rust Blast or Chem removal?

I have a few rusty spots on my CJ7 nothing major fenders, doors, hood. (tub is fiberglass)

I haven't used chemical rust removers before and never used walnut to blast rust. I have plenty walnut media to blast with and don't mind buying rust remover chemicals.

My fear with rust removers is, will I be able to clean it off well enough to make paint stick and stay, and will media blasting keep the rust from forming under the paint later?

another is the rusty spots on the fenders are at the seam where the two pieces are touching, how can i get under there to get it clean?

last thing, what primer is best for bare metal (after I remove the rust)?

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post #2 of 4 Old 05-18-2021, 11:34 PM
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Join Date: May 2021
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hello I am new on this site
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post #3 of 4 Old 05-20-2021, 11:44 AM
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1961 CJ5 
Join Date: Jun 2011
Location: Pauma Valley
Posts: 18
When I was working on my CJ I knew I wanted to coat the tub with Raptor liner. I spoke with the rep at U-pol USA and asked what they recommended for surface prep. I mentioned I was thinking about chemical dipping and he told me the following: with chemical dipping the liquid will get into places the new primer/paint can not. The liquid will remove any rust protection stuff in those nooks and crannies. He recommended a media blast (walnut specifically) to prep then primer and paint.

Chemical dipping has been around for a while and I wouldn't be hesitant to use it for single panels (had i stripped the tub even more) but with shaped and spot welded panels I'd probably recommend media blasting.
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post #4 of 4 Old 05-25-2021, 06:07 AM Thread Starter
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1985 CJ7 
Join Date: Mar 2021
Location: Kinston
Posts: 20
My tub is fiberglass, all I have rust on is the front fenders, hood, grille and I'm going to have to replace the windshield frame as it's rusted on the corner by the drivers door. I tried blasting with walnut but my sandblaster wouldn't work ( i feel like it would've worked great if it had worked at all) I ended up wire wheeling the small spots and 80 grit on the DA on the large spots. I stripped it back to shiny bare metal, filled and primed with SEM gray etch primer.

I am going to have to replace the frame around the back glass and I have a small spot on the tail gate that needs repairing but it's going to wait.
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