Rust--Still An FJ Issue? - Page 2 - Toyota FJ Cruiser Forum
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post #11 of 20 (permalink) Old 02-19-2013, 10:50 PM
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Re: Rust--Still An FJ Issue?

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I just spray the crap out of the undercarriage with this: AMSOIL MP Heavy-Duty Metal Protector No rust so far after 2 years!
Do you have to apply before rust starts? I have a bit on the welds and my front dif is covered.
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post #12 of 20 (permalink) Old 02-19-2013, 11:04 PM
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Re: Rust--Still An FJ Issue?

I coated the underside with Por-15 about a year after I bought my fj. When I coated her, the underside looked like the factory coating was holding up quite well but I would rather not take the chance. It only takes a few hours if you have a lift.

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post #13 of 20 (permalink) Old 02-19-2013, 11:11 PM
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Re: Rust--Still An FJ Issue?

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I coated the underside with Por-15 about a year after I bought my fj. When I coated her, the underside looked like the factory coating was holding up quite well but I would rather not take the chance. It only takes a few hours if you have a lift.
POR-15 work fantastically. It actually adheres better to rust than bare metal.

Though, it is kind of a pain in the butt with the amount of prep work needed, with the metal-ready, and cleaner, then applying.

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post #14 of 20 (permalink) Old 02-20-2013, 12:44 PM
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Re: Rust--Still An FJ Issue?

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Do you have to apply before rust starts? I have a bit on the welds and my front dif is covered.
Nope. Just spray it on and it penetrates and turns into a hard wax. It does need reapplication every couple of years.Cool thing is that it is a motorcycle chain lube as well.

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post #15 of 20 (permalink) Old 02-22-2013, 11:17 AM
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Re: Rust--Still An FJ Issue?

So dirt wont stick to this stuff ? So far mine is good, but I spend a great deal of time on logging roads and am looking for some additional protection. Thought about just using rubberized undercoat but not sure that would slow the rust process any if its being applied over existing rust.

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post #16 of 20 (permalink) Old 03-03-2013, 07:55 PM
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Re: Rust--Still An FJ Issue?

If you spray over rust with an overcoat like line-x or bedliner, you will not stop the rust. If anything you may complicate things. Negate the rust either chemically or physically before going this route. Since new, I have been using Amsoil MP HD and rust is at a minimum. The wax finish should repel mud or at least make it easier to rinse off. Get as much loose debris off the underside before applying.

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post #17 of 20 (permalink) Old 03-07-2013, 10:24 AM
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Re: Rust--Still An FJ Issue?

I work for a dealer and we see it all the time. The rot that occurred in the Tundra's and Tacoms's was pretty bad on some vehicles and others were absolutely fine. Toyota does not manufacture or treat the frames that were going bad so they made a change in the company that makes the frames for them. We did see our first Sequoia that had severe frame rot and are in the process if seeing if Toyota is going to cover that one.

From my personal experience, gulf states, east coast and cold weather climate vehicles are always far worse than other regions. Even cars from the great lakes regions have severe corrosion, even when brand new. The salt water air just wreaks havoc on the metal surfaces. Cars that are in the saltwater climates are much worse than say the Midwest where we get plenty of snow and subsequently sand, salt and brine solution coating our city streets.

On another note, some surface corrosion is almost always normal. I have never seen a frame or differential fail from surface rust. I see it on every vehicle that pulls through the shop and it is almost never a concern. Some bolts will get rusty and hard to remove but other than exhaust, we just don't see it as a huge problem.

I for one, just clean the underside on a fairly regular basis.
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post #18 of 20 (permalink) Old 03-07-2013, 12:56 PM
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Re: Rust--Still An FJ Issue?

This thread gave me a great idea! My past life as a sailor reminded me of a way we used to mitigate corrosion on ships and equipment exposed to salt spray. Zinc! We used to have sacrificial zinc blocks we used to bolt to structures. The zinc corrodes instead of the metal surface it is attached to. There are several threaded holes on the frame and suspension that chunks of zinc can be attached to. Be sure it has a good electrical connection to the part you are trying to protect.

Chemistry - Rust prevention by sacrificial anodes

Cathodic protection - Wikipedia, the free encyclopedia

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post #19 of 20 (permalink) Old 03-07-2013, 05:32 PM
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Re: Re: Rust--Still An FJ Issue?

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This thread gave me a great idea! My past life as a sailor reminded me of a way we used to mitigate corrosion on ships and equipment exposed to salt spray. Zinc! We used to have sacrificial zinc blocks we used to bolt to structures. The zinc corrodes instead of the metal surface it is attached to. There are several threaded holes on the frame and suspension that chunks of zinc can be attached to. Be sure it has a good electrical connection to the part you are trying to protect.

Chemistry - Rust prevention by sacrificial anodes

Cathodic protection - Wikipedia, the free encyclopedia
Great post. It worked on my outboard motors.


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post #20 of 20 (permalink) Old 03-08-2013, 10:56 AM
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Re: Rust--Still An FJ Issue?

^^^ If you are going to use the sacrificial metal method, be sure not to cover the zinc surface with any preservative. You actually want the sacrificial metal to oxidize.

This looks like a great resource: Bolt-On Zinc Anodes

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