Metal Shed Buildings

How can you protect an electric motor from rusting in heavy fog?
I just purchased a mobile tank sprayer with an electric motor. During the winter months heavy fog rolls in almost every night (I live in California) and doesn't really burn off during the day. In general, there is a lot of moisture in the air at night. I've noticed that anything metal left out can form a coating of rust in about a week. How can I protect the motor from forming rust when not in use?
Storing the sprayer inside say a garage won't work as I don't have one. Even if I did have a storage shed, how would I keep moisture from getting in? I'll look, but even if the motor is rated for outdoor use, there are still components on the sprayer that can rust. What about motors that are not rated for outdoor use?
On another note, how can I store/protect tools etc from rusting in these conditions? I do have a few out-buildings, but they are hardly moisture proof.
Thanks for the info.
Never Ever use WD-40. It's low vapor pressure attracts moisture and will make it worse. Put some in a clear glass for a month on a covered porch and watch it turn white with the moisture it collects. In two months you will see water in the bottom of the glass. Use a military grade rust preventative such as CRC SP-400 which you can purchase from McMaster Carr, it is stock number 10505K31 in an aerosol can for about $12 plus shipping.
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