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Ford 9N, 2N & 8N Discussion Forum
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Rust reformers/converters

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Mad Farmer

11-12-2023 08:10:21




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General question for nasty rusty parts.

I've got to clean up some parts on tractors/trucks/trailers that are rusted up. Some is pretty nasty will need to chip and grind caked on corrosion. None of this stuff will ever be pristine again. Most pressing is a trailer rim that will take a tube so not so concerned about a bead/valve seal. Would also like to treat some frame surfaces that are just starting to rust.

What have people used in the rust converter/reformer chemicals? I see small spray cans/bottles and quart/gallon jugs. Some quite expensive.

Sprays seem convenient but expensive. Some liquids can be transferred to spray bottles, or brushed on.

I'm looking to chip/grind all loose stuff but not deal with all pits. Lots of these claim a impervious/paintable surface upon treatment.

What has been luck with painting over the treated surfaces and is there much prep to do so?

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93699mopar

11-17-2023 20:20:06




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 Re: Rust reformers/converters in reply to Mad Farmer, 11-12-2023 08:10:21  
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we use coroseal on the towboats i work on after prepping best we can with a needle gun and wire wheel, i find we get better results with that than ospho tho it is more expensive. if you cant or dont want to remove all the rust out of the pits or cant get at them with anything, penetrol paint additive by flood can also be used to treat bare metal. it doesnt convert the rust but its penetrative qualitys cause it to soak into rust scale that can not be removed displacing all the oxygen anf preventing further growth of the pits or rust. it is also a wonderful additive to paint to make it stick better, dry harder, and lay down flat. can get spray,d finish out of roller or brush even.

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showcrop

11-15-2023 06:56:28




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 Re: Rust reformers/converters in reply to Mad Farmer, 11-12-2023 08:10:21  
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I find phosphoric acid to be a super converter. The limitation is in the lack of uniformity of the rust. if it were an even light coating the whole surface would turn black and be protected to a degree. The reality is that heavier areas should get a repeat coat and the light areas need to be thoroughly rinsed or you get white residue. It requires a little attention.

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Factotum

11-15-2023 05:57:33




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 Re: Rust reformers/converters in reply to Mad Farmer, 11-12-2023 08:10:21  
I have had good results using a wire cup and Evaporust. The parts usually need to be submerged but I have used some old t-shirts and rags to keep the surfaces wet on surfaces too large to be submerged. Evaporust and similar rust converter products can be reused many times, so if you can submerge small parts, save it for next time. Unfortunately wetting with rags makes it had to save. Good luck on your project.

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DennyD

11-14-2023 04:51:59




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 Re: Rust reformers/converters in reply to Mad Farmer, 11-12-2023 08:10:21  
Phosphoric acid is an etcher, but not that great as a converter or as corrosion protection alone. If you use it to etch steel/iron, I'd advise immediately coating with an encapsulating paint (POR-15, etc.); otherwise, the metal will be vulnerable to oxidation.



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Mad Farmer

11-13-2023 13:51:17




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 Re: Rust reformers/converters in reply to Mad Farmer, 11-12-2023 08:10:21  
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Trailer is made from an old boat trailer w/S10 chevy bed mounted on it. Oddball rims and the hubs take bolts rather than having studs. Would be an odyssey trying to find a matching rim. 15" car/truck tires fit the rim.

Besides the trailer rims I have other rust metal projects to do also..... ..



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showcrop

11-13-2023 13:40:48




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 Re: Rust reformers/converters in reply to Mad Farmer, 11-12-2023 08:10:21  
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The instructions that came with the expensive stuff said to agitate with the brush after a few minutes and after 15 mins flush it off, so that's how I do it. Be sure to rinse it well as I posted earlier, and yes once it is good and dry it is ready for paint.



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DanielW

11-13-2023 12:26:02




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 Re: Rust reformers/converters in reply to Mad Farmer, 11-12-2023 08:10:21  
I agree with Showcrop's suggestion of phosphoric acid/milkstone remover/naval jelly. While other products may work, I find it works the best, and it converts the iron oxide rust to iron phosphate, which forms a protective coating on the bare metal and prevents further rust.

Not all rust removers contain phosphoric acid. In fact, most of the modern, fancy-pants ones (like 'Evap-O-Rust') don't. I find these new style of rust removers don't work nearly as well. They still form a protective coating on the bare metal, but they aren't nearly as good at dissolving heavy rust. Good for light surface rust, but not for a heavily putted rim.

If you haven't bought yourself a needle scaler yet, go do so. They're the best thing ever for scale/flaky rust.

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R Geiger

11-13-2023 11:37:59




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 Re: Rust reformers/converters in reply to Mad Farmer, 11-12-2023 08:10:21  
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I think I would just replace the rim and move on!



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Mad Farmer

11-13-2023 11:36:27




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 Re: Rust reformers/converters in reply to Mad Farmer, 11-12-2023 08:10:21  
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Showcrop thanks. I just checked TSC they have milkstone converter which is ~56% phosphoric acid.

Do you just brush it on and let it set a while, then rinse/brush off?

About how long until you can paint it? Is good and dry good enough?

Thanks , MF



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showcrop

11-13-2023 05:34:23




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 Re: Rust reformers/converters in reply to Mad Farmer, 11-12-2023 08:10:21  
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There are numerous rust converters, all of which are Phosphoric acid based. I use it a lot but I get it free from where I work. You can get it reasonably priced as Delimer at a restaurant supply store , or as milkstone remover at a dairy supply. You need to remove pretty much all of the loose rust before applying the acid, and work it around good with a brush. For cleaning before using the acid it is hard to beat a 40 grit flap wheel. Twisted wire cup style wire wheels are very effective too. grinding wheels are useless for rust removal. The acid is very good on pits. Don't let it dry on. You need to rinse excess off because you wan to minimize white powdery residue. I toss small parts in a bucket of water, and pressure wash larger pieces.

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Mad Farmer

11-12-2023 10:18:34




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 Re: Rust reformers/converters in reply to Mad Farmer, 11-12-2023 08:10:21  
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Thanks, I'll look into that. Local Ace Hardware has gallons $28.

I'm off to grind and scrape a rusted trailer rim....



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Eman85

11-12-2023 08:55:09




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 Re: Rust reformers/converters in reply to Mad Farmer, 11-12-2023 08:10:21  
I have been using Ospho available at Ace Hardware.



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