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"rustproof" is also used as a crossword clue. If that's what you saw, the answer is often stainless (9 letters).
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R________
Definitions
treated against rusting
Word origin
From rust + -proof.
Used in a sentence
“This is supposed to be a rustproof trashcan, but it can't handle the salt they use on our roads.”
“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.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer0 curated clues
No curated clues for rustproof yet.