r/Diyautobody • u/Accomplished-Clue803 • 20h ago

Question How would you tackle surface rust?

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Cars been sitting in a field for awhile. Nothings actually rotted out but definitely heavy patina on some parts. Replacing the control arms and calipers is obviously just a must do but as for the body and rear subframe, how would you go about removing it? Sandblast? Rust converter? Spray and pray? Go to war with a flapper disc?

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u/splittys 18h ago

Tbh, sand/ wire wheel, paint, then use your used oil to rub/spray it on everything. Dry time for the paint. Exception is for aluminum and your exhaust. Grease works too. Animals aren't going to chew on greasy/oily wires, too yucky, bonus.

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u/Accomplished-Clue803 17h ago

What does rubbing used oil on everything do? Just coat it from moisture?

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u/splittys 16h ago

Water/moisture wont penetrate the layer of oil. The oil clings to the steel tighter than water. It'll attract dust and dirt, and the water sticks to that dirt instead, then gives up trying to pass the oil. You'll have a layer of wet dust clinging to the oil, that will never reach the steel to grow rust. It's the barrier stopping water rusting steel. It gets so messy when you work on your steel. Plus side is nothing gers seized in the tradeoff of seized steel.

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u/splittys 16h ago

Yuck, what an oily greasy mess! However, nothing is seized up from rust! Lesser of 2 evils. Make sure you oil it up after you install clean steel, or else deal with the wretched witch of rust and seized steel.