ospho - seems to work as promised - Defender Source
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  #1  
Old May 28th, 2011, 07:58 PM
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ospho - seems to work as promised

I just sprayed the truck down with Ospho and it actually does treat the rust. Frame, riggers, crossembers, shock towers, blts, door bottoms etc. Anything steel that wasn't waxoyled was hissing from the reaction. After the postwash, all previously rusted parts are now a chalky white color, presumably some kind of oxide film, under which is a black phosphatized finish.

Btw, it doesn't seem to react at all with aluminum (at least in the short term), and galvanized parts react quite vigorously with it. It seems to completely clean any trace of rust off old galvanized components.

I ordered mine from my local Ace Hardware for $24 a gallon. 3/4 of which did my entire truck. A good temporary treatment without having to resort to por15 just in case I actually want to refinish my truck.
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  #2  
Old May 29th, 2011, 11:37 AM
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X2 it really is good stuff i have used it extensively on my classic.
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Old May 30th, 2011, 06:02 AM
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Good to know. I tried a couple products here in the UK, neither was much good. I think environmental regs keep the effective chemicals out of private hands. In the US I've used Rust Mort in the past, it works well too.

Long term I want to either replace the chassis or build a custom/hybrid/whatever, but in the near term I could use some rust fixin'.
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Old May 30th, 2011, 06:12 PM
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Pics please? Preferably before and after to get an idea if the results.
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Old May 30th, 2011, 10:35 PM
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we used that a lot in the Coast Guard. Good stuff.
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  #6  
Old May 31st, 2011, 01:41 AM
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Would love to see pics too. Never heard of this stuff. I'm guessing it's best for mild surface rust only?
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Old May 31st, 2011, 08:24 AM
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Phosphoric acid is serious stuff. Just be careful when you use it, with certain metals you will end up with hydrogen gas.
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Old May 31st, 2011, 11:36 AM
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Originally Posted by specops1526 View Post
Would love to see pics too. Never heard of this stuff. I'm guessing it's best for mild surface rust only?
Yes, mild surface rust only.

I'll post two pics tonight, one of a section with mild rust and my driver footwell, which has more severe rust (and which did not benefit much from the ospho)

It's definitely not magic and will not turn rotted crossmembers into gleaming new 1/8" thick mild steel box sections
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Old May 31st, 2011, 12:59 PM
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You can also convert rusted parts using lye and a battery charger. It also takes off paint and grease.
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Old May 31st, 2011, 01:06 PM
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I tried this and had limited success. Minor surface rust only for me.
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Old May 31st, 2011, 02:46 PM
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What's the actual process? I assume clean, dry, apply ospho (by spraying?), then allow to dry again? Are you supposed to then paint over it?

I might be interested in trying this out too
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Old May 31st, 2011, 02:56 PM
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Changes iron oxide (rust) to iron phosphate (hard black stuff that doesn't rust anymore). It has to penetrate all the way to be effective; that's why it can't be too heavly rusted. I too have had good results with it. Used it this past weekend while cleaning up a frame.
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Old May 31st, 2011, 05:19 PM
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So if you sprayed this on the underside of a truck, what potential issues could arise?
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Old February 2nd, 2012, 10:18 PM
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I found a cheaper alternative to Ospho. It's called Klean-Strip Prep & Etch. $14.00 a gallon at Home Depot. This is half the price of Ospho.

MSDS says it's a 50% solution of phosphoric acid. Ospho is 33%.This is nasty stuff, do not get it on your bare skin.

I prefer submerging parts that are heavily rusted. Overnight it works well. It strips the paint off of most anything I put into it.

regarding Ospho:
Spraying it on my truck's underside worked well for surface rust. Spray application won't do much to deeper rust...that needs to be sanded/ground out.

I'd be VERY careful about spraying the Prep & Etch, dilute it in half at least.
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