rustproof

[ruhst-proof]
adjective
1.
not subject to rusting.
verb (used with object)
2.
to coat with a substance that prevents rusting.

Origin:
1685–95; rust + -proof

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rustproof (ˈrʌstˌpruːf)
 
adj
treated against rusting

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
To add to the life of any metal barrier, spray on two coats of rustproof paint
  before installation.
To add to the life of underground barriers, spray on two coats of rustproof
  paint before installation.
To add to the life of the barrier, spray on two coats of rustproof paint before
  installation.
Non-corrosive, rustproof staples are acceptable in instances when paper records
  are strong and flexible.
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