Even fresh water is a problem. ;-)
Before I owned it, an airplane I had a while back was parked outside during winter in Portland. There was a small leak in the windshield that allowed water to run down into the inside of the belly of the airplane. Unfortunately, when they painted the airplane, they blocked the drains, so the water had no place to go.
First flight after the winter (to my mechanic for a prebuy) the airplane was a water bomber, with no way to release the water. Turn base, slosh, turn final, slosh, turn off runway, slosh.
We did not detect any corrosion in the airplane, so I bought it. But I would think that sitting in a pool of even pure rainwater would have some detrimental effect sooner or later.
Besides changing the weight and balance, real-time... ;-)
Kevin
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