Anybody use Rust Doctor products? - Defender Source
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Old April 28th, 2005, 04:25 PM
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Anybody use Rust Doctor products?

This product claims to turn rust into inert iron oxide so you can just paint rusted metal parts and stop them from further rusting. It's $29 for a quart so I might try it on my rear tire carrier.


http://www.therustdoctor.com/how-to/index.html
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Old April 28th, 2005, 05:24 PM
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Just go to your hardware store and get some rustoleum rust coating paint (for iron fencing) in matte or flat black. It's like $5 a quart and does the same thing. Get a 25 brush so you can toss it afterward instead of trying to clean it out.
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Old April 28th, 2005, 05:36 PM
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I thought Rustoleum was only supposed to prevent rust.

This rustdoctor stuff is supposed to convert rust into magnetite, a form of iron oxide which no longer reacts with oxygen or water. It sounds different than rustoleum.
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Old April 28th, 2005, 07:06 PM
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Oops, I just checked in the garage and I meant Hammerite Rust Cap. It forms a glass-like coating over the rust and prevents further rusting. Rust is just iron that is oxidizing. Since it flakes off, the layers under the rust can then oxidize, so you need to cover it with something that doesn't let water and oxygen through and doesn't flake off. Since Aluminum oxide doesn't flake, it actually forms a protective coating; hence aluminum's "corrosion resistance". There are lots of products designed to coat and prevent rust. $29 a quart is just silly.
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Old April 29th, 2005, 07:49 AM
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I found another cheaper product here:

http://www.interstateproducts.com/rustkiller.htm

This is $40/gallon cheaper but still pricey.

These products claim that through a chemical reaction they actually convert rust into a different substance so that the rust no longer exists. The Rust Doctor product called it Magnetite. That's different then just coating and preventing rust.

I don't know if it's neccessary, maybe they acheive the same purpose.
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Old April 29th, 2005, 08:05 AM
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Iron can't rust if it doesn't have oxygen and water. So any coating that doesn't come off will do. FYI Magnetite is just the name for naturally occuring magnetite iron oxide - It's completely oxidized but also doesn't flake apart.
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Old April 29th, 2005, 08:12 AM
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Sounds like a cool science experiment, but not worth $29/quart. Thanks for the info.
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Old April 29th, 2005, 08:14 AM
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If I can remember when I get home, I'll post before and after pics of my bumper - I used the Rust Cap product and it looks like a new bumper. I also used it on the tire carrier, but it is a pretty small area.
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