Fords, Chevys, Dodges,Toyota etc…….all come to the customer already painted. And in no time flat they rust like alec Baldwin . The difference here is the rifle costs 1 or 2 months payment for the mobile rust away buckets. 
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Mine don’t. Unless the surface of the paint is damaged.
My EC9s did, even when i put it inside a sealed case. I do live in Texas, i put CLP on it, but i don’t wanna carry a great gun, so eventually i just rattle can-ed it black with old trusty Rust-Oleum
Is this for/on all AK receivers from PSA? If so cool
Taking notes on what different companies do and found this thread from some years back.
On a side note, One of my AKs gets direct sprays/humid from the shower ever other day for two years and looks brand new. So. Not sure what happened above fwiw.
PSA does all their AK’s the same.
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Arsenal is paint over park, their finish is known to be poor. Basically wipes off with most cleaners .
Wbp and FB probably share a finish if I were a to guess. They don’t share exactly the same factory, but they do share some parts. I think it’s phosphate.
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I had a freind who use to work at a company that would plasma coat paper mill rollers for corrosion ,grip or lubrication. They could adjust the powder for smooth to rough. It looked cool.
I wonder if psa would consider r n d. Its like spray paint with fire and powdered metal!
I would totally volunteer to test the durability and long-term exposure to abuse on the sample guns 
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Better off sandblasting or buy a new one. Consider this a learning experience. You can strip these downs in a few minutes and after a sandblast just cerekote…Might as well get a new barrel too. They are pretty cheap
