This has probably been asked a thousand times over. Did a search for it "Rust", "Rust stripper". Came up with rim work instead.

Anyways, just bough a 98 Cherokee. The undercarriage has some surface rust. After a thorough inspection, it doesn't seem to have eaten through anything or caused any structural damage. Just your typical Northeast surface rust.

I'll probably take a wire brush to the larger areas first. However I am looking for a spray (such as Rustoleum) to take off the rest in the hard to get areas. Any recommendations on these rust strippers? Will Rustoleum work? And how should I go about doing the job?

Also I'm looking for a good sealer. I was raised putting used motor oil into a squirtgun. Any suggestions? Something that can seep into joints and cracks.

 

If it's just surface rust you can use that rustoleum rust reformer stuff. If it's rusted through, short of welding in new metal, there isn't much you can do...