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My front inner fenders are in great shape, as are the fenders, however there is nothing protecting the inside of these from road "debris" i.e. paint, grease, gum, etc. I have been unable to find inner fender LINERS for our trucks. Assuming Ford never made them, but a little surprised no aftermarket exists either?
Back in the days before plastic inner fender liners, spray or roll on undercoating was used.
I think I saw my first plastic inner fenders in the mid 80’s.
That being said, I imagine you could get some plastic inners from a later model pickup, maybe in the 90’s, and modify it to fit. It wouldn’t be a perfect fit, but it would help keep water and mud from getting into the pockets in the fender wells.
The rust issue on slick fenders Comes from a poor seal on the foam cowl seal, and the caulk between inner fender and fender. Keep in mind, getting wet, and staying wet are two different things. Driving around with those seals bad not only allows water in, but also dirt. The dirt will stay damp long after the painted surfaces dry out, rust starts, and rust never sleeps.
The issue is not rust (though I can see how that could be a problem), it is dirt, road dirt/tar. It's terribly hard to clean up there and it's amazing what all is exposed to whatever comes off the tires. I'm damn sure not the first to complain about that I'm certain.
The only thing not in untouched factory form is the dirt, light source and tire.
Back in the 1st part of my career, about 25 - 30 years ago, I worked with Georgetown Vacuum Forming to make us inserts for a tool kit we were designing in support of a fiber optic connector project. Very simple operation, and dirt cheap once you have your "mold"(form?) done. Most were made of wood and very crude. Ours were CNC milled from billet alum. because...we could, lol. It would not take much to make the necessary mold/forms, but as has been very clearly mentioned, there may not be much of a demand.
I think it’s telling that, with as popular and numerous as the 60’s Mustangs are, there’s not inner fender liners produced for that market, which obviously has a huge aftermarket network. Cars & trucks of the 60’s and earlier generally didn’t have inner fender liners and apparently folks aren’t pushing much for them.
Once the manufacturers started using thinner sheet metal, the liners became necessary to prevent dents from even small stones. I think the dentsides were the first ford trucks that had liners?
It is telling, and surprising. Especially in light of the fanatics that have beautifully maintained classics who are not worried about road debris mucking things up? Yeah, I'm a little surprised by that.
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