There is a product called Rust Mort that lays down like a primer. If the rust is just starting in small spots you could try to sand the rust out, apply Rust Mort, and touch up over it. Just a thought, but rust is a total pain in the butt to stop from spreading. Here's a link to the product we've used in the past.

https://www.amazon.com/SEM-69504-Rust-Mort-Quart/dp/B000HI690U

u/ZippyTheChicken · 2 points r/vandwellers

Food Grade 85% .. insanely strong when not diluted.. you can dilute 5 to 1 water to acid or 10:1 water to acid easily. I have put rusty bolts in the undiluted and they come out like they were sandblasted in about an hour.. the threads all cleaned out like new.

https://www.amazon.com/Gallon-Grade-Phosphoric-Remover-Clean/dp/B06XZSW3QX

or you can buy a quart of rustmort which i always use to use as an autobody tech .. its great .. I would say its probably a 10:1 dilution

https://www.amazon.com/SEM-69504-Rust-Mort-Quart/dp/B000HI690U/

this is why I will never drink cola drinks again

https://jillcataldo.com/wp-content/uploads/2017/04/cokeingredients.jpg

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