I have an older farm trailer, tadem axle. I used a gal. of the "brush on" Rustoleum in black. Painted it over the grass so drips would not get on the drive. Laid it on as thick as I could get it. The directions said to get as heavy a coat as possible. That was 8 years ago. It stopped the rust cold. Not the best looking farm trailer around so if you need a custom matched paint job to go with your truck may look for something else. But this is the cheap fix that works.
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