Wiktionary
vb. (en-past of: weatherproof)
Usage examples of "weatherproofed".
What he saw was a dull green weatherproofed little metal cabinet with a telegraph wire led into it from the crossbar.
And a great stack of weatherproofed sun mattresses and pillows in all kinds of colors.
John, like all aviators, was infatuated with automobiles, and when a 1949 Mercury convertible crashed on the Boulder-Denver speedway, he bought the wreckage for $75, and with the help of two other officers taking advanced courses at Colorado University, rebuilt it into a fine, sturdy machine with a homemade canvas top weatherproofed by an expensive liquid concocted for the Air Force.
Installed at the tripartite junction was a first-rate weatherproofed road sign, newly stamped and finished, that had been knocked sufficiently askew to render the directions imprinted thereon as useless as tits on a boar hog.