Using wax and grease removal clean the surface.
Best way to clean up a rusty truck frame.
We placed a few fans under the truck to speed up the drying process in order to get on with the rest of the prepping.
Once you ve cleaned up the frame axles and suspension to the best of your ability pressure wash everything and allow it to dry.
Literally little walnut husks flying at high speed blew the rust right off clean and down to bare metal.
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After years of driving the tubing can become filled with rust dirt and gravel allowing for moisture to soak and eventually rotting out the frame.
For tighter areas we relied on a 5 in 1 scraper wire brush and even sand paper.
Lower the truck onto the jack stands.
Leave a space of 6 inches in all sides.
Cover the area that surrounds the rusty area.
The best way more like the easiest way and least time consuming.
Get fluid film here.
I let my frame rust a little too much.
Prepare the area using plastic sheeting and a tape.
I had the guy come over and media blast the entire frame and underside of the cargo bed.
You can flush water through the frame then follow up with compressed air to help the inside dry.
Raise the truck and place jack stands under the frame near each front tire.
In this video i restore a frame using a rust converter.
Https amzn to 2dcv8lt more links below just showing what i did.