Other parts of the vehicle, including brake calipers, nuts and bolts, can corrode as well, according to John Rintoul, an engineer and lifelong resident of San Diego. He lives less than a mile from the ocean and works on cars, motorcycles and scooters in his free time, giving him an inside look at the damage caused by the ocean environment. He says salty humidity and dew are among the largest factors in progressing corrosion, particularly during certain times of the year.

"Winter is the worst, since summer has much less dew during the nights and mornings," Rintoul says. "The water droplets create sites where corrosion can occur, and salt helps to accelerate the corrosion."

Rintoul also notes that the longer his cars have been exposed to the ocean, the more damage he notices. "There is a honeymoon period of about three to five years where you probably won't see much damage," he says. "Then, in five to seven years, minor rust spots can develop on the car." If you can replace the rusty parts, like the bolts and nuts, he adds, you should do so before corrosion weakens the parts to the point of failure. If the body of the car is extremely corroded, however, Rintoul says that in his experience, it is sometimes cheaper to replace the car rather than try to fix and repaint it.