I have used a spray on product called LPS-3 to inhibit rust on just about anything. I just bought a truck and will apply this before the bed liner goes in. It is a relatively heavy wax based product that really sticks, but is removable if you work at it. It comes in three grades (LPS 1, LPS 2, and LPS 3). The LPS 1 is about like WD-40 in consistancy. Not much good for rust inhibitor. The consistancy gets heavier as the number increases. Get it at better hardware stores.
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