Re: 2003 Tundra Bed Bolts!!!
Are we talking surface rust or rust that is penetrating into the bolt? Surface rust is to be expected. If the bolts are rusting through, you can probably replace them with Grade 8 hardware from the hardware store. You could buy the bolts through a dealer, too. As for preventing rust, I wouldn't paint any bolt threads as that will make it very difficult to unbolt. 3M, I think, has a spray coating designed to protect boat trailer hardware. Spraying your bolts 2x's a year with that will definately keep off the rust.
If you have big rust issues on the underside, spray paint won't cut it. Zero rust is a product designed to be applied over surface rust, bare metal, or scuffed painted surfaces. It will cover metal and seal out air. I don't think you really need to do this unless you are driving IN salt water!
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