Did you mean rustproof?
rustproof
adjective
°Resistant to rust, oxidation and corrosion.
"This is supposed to be a rustproof trashcan, but it can't handle the salt they use on our roads."
verb
°To make resistant to rust, such as by applying a coating.
"We'll rustproof the metal with a good coat of paint and then we'll be able to leave it outdoors for years without damage."