Bought another car & Frame rust

Morning Santa,

If you can get your hands on a little "spot sand blaster" you can give the affected area a very good clean without spraying blasting grit everywhere else. They have a small rubber surround that you butt up against the area you wish to blast, problem is that you can only blast an area about the size of a twenty cent piece at a time. In saying that, this would be the most effective way of removing your rust problem. After blasting give it a good lick with some killrust and Robert's your father's brother.

If you can't get hold of a little spot blaster, run a 4" grinder over the top with a course sanding pad on. This will remove the majority of the rust, then use a die grinder with a very pointy bit to get into all the pitting and hard to reach places.

The biggest thing to stress here is DO NOT TOUCH BARE METAL WITH YOUR HANDS. The acid on yours fingers and palms can initiate the oxidisation process all over again.

Hope this is of some help,
Heffers

I had a jackaroo with similar inside Chasis Rusting.I got to all the holes in the chasis rail with a wire brush and cleaned dirt away.Got a tube of quality Black Silicon to every little nook and granny I could find along chassis rail and sealed it.Then bought gearbox oil 1 litre pack that has squeezer tube on it and used this to pump oil into chassis.Had to try a couple of times as yuo get leaks.Basically sealed the chasis to prevent it getting worse.Its a messy job and dont park car on the concrete drive for a while

I use a wire brush in the angle grinder on the outside or where I can get to.
If light rust, even a good scraping to get the worst off helps.
Then hit it with rust convertor.

Then clean it and use penetrol.

If it is only light rust, just penetrol.

My biggest worry is getting inside the chassis rails.
The above idea about sealing the holessounds OK, and maybe use 50% sump oil and 50% fish oil.
Once, I did get a panel beater who had made up a 3m long hose with a 180 degree spray on the end go through and spray inside all the chassis rails.

Clean out the bungs after a month, so any future water penetration can get out.

Rust on the inside of the frame is likely to have created a weak point. It's very much like Cancer, once it's there, it's almost impossible to get rid of. You might need to consider plating the chassis (expert job) to maintain vehicle roadworthiness and safety. Check it thoroughly, don't take any chances. It could cost you or someone else their lives.

Clean it out and then get some of this stuff.
Staun 329