i've heard of guys putting alittle used motor oil in. never tried it though.
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I heard that too. I have plenty of that lying around.
I just want to be able to get all the surface rust out first, then oil it you know.
I hate asking this, but, can you cut part of the top frame rail off, then clean the inside and then weld it closed? I know cutting the frame is a last resort for alot of repairs, but I really want a rust free rig.
Only thing I can think of is to just drill small holes in the frame and use an undercoating spray gun and just spray por 15 in the inside of it. I guess you can sand blast the inside of it prior using this method.
if you can get ahold of some phosphoric acid (make sure you use safety first with this stuff ;] ) get a decent sprayer and spray a fair amount on the inside. let it sit for about 30 mins...spray the inside with water to wash out... find some sort of heat blaster to dry it out... repeat acid...repeat wash and dry...coat it with POR15.
i know this is possible ive been wanting to do it for quite some time without cutting into the frame. if you try and accomplish this let me know because i do know that acid will obliterate any rust or oxidation
i know this is not 100% on topic, but i (along with many others) drilled about a half inch hole in the bottom of the rear crossmember (at rear bumper) to make it easier to hose the mud and gunk out from inside. it gives it a place to go.
Tried the drain oil trick on my TJ, kinda worked on the lowest points in the frame but the rest immediately dried out. Gonna try urethane foam on the YJ. My Silverado has this stuff on the inside of the rocker pannels and it seems to work pretty good.
If the frame is really rusty, it needs the bad sections to be cut out and replaced. If you have surface rust, don't worry about it. If you really feel the need to do something about surface rust, apply POR-15.
Urethane foam is another word for sponge. It will hold water and accelerate rusting.
Every spring and fall, stuff a garden hose in the frame rail holes and flush out any dirt, mud, salt, sand, or other goop. It is not short term exposure to water that rusts out Jeep frames, it is the damp mud and goop that holds water long term that causes rust.
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Many of the products on this site can be used on rust all you would need is a wand type sprayer and use it to reach through the existing factory holes in the frame. I believe they may even have a sprayer and a coating specifically for the inside of frames.
The stuff used in my Silverado is absolutly waterproof and bonded really good to the metal. It's the stuff used in autobody repair, not the stuff sold in home impovment stores. Anything that excludes water and oxygen will prevent rust. My only concern with using it is what happens when welding nearby.
In a warm month flush out your frame and get all the gunk out of it.
You have to get all the stuff out that's trapping moisture.
Let it dry.
Spray the Anti-Rust in there with an undercoating gun with a wand.
(Wear a mask, gloves and some old clothes!)
Eastwood anti-rust is a wax that will coat and protect the interior of your frame in the same way as the oil treatment. I repeat this about 2 times a year. So far it's worked well. If you have major rust inside your frame you might need to use another product.