Well, if you've ever seen, and tried to remove, the undercoating from the directly-exposed inner fenders of a late 50s Mopar, you see that the undercoating did its
job. Those inner fenders would have been swiss cheese without it. So if that kind of protection had been applied right up to the inner edge of the eyebrows, it would have likely been a non-issue. But they cheaped out and it cost them.
When I did my 58 Plymouth, the fenders were media blasted inside and out. Then a thick layer of Bill Hirsh Miracle Paint (similar to POR-15) was applied to the problem
areas of the fender (inner eyebrows, lower rear part of the fender where the reinforcement brace is welded) as a barrier coat, then the entire fender was epoxy primed. Twenty years later, no problems. Same procedure for the inner quarters and rear wheel well
openings, BTW.
Ron
This was common, it was not just undercoating , design caused impacted junk to fill that , thrown by front tire . Add damp salt , no paint can stop that . It even takes out headlight buckets too . And all the metal holes pierced around screws rust and fall
out forward .
So after repairing 57 dodge eyebrow with hand fabbed pieces , a lot of work ( could not find eyebrow patches anymore) and painting the inside with rustoleum , we put in a cut to shape stainless steel blocker sheet behind the headlights , caulked far edges
to fender and it bolts on a lip to apron , no more packing in of junk . They should have done that
Sent from my iPhone
Don Warnaar mentioned the eyebrows rusting out on our late 50s Mopars. One of the reasons that happened was that Chrysler never bothered to undercoat the last 6
- 8 inches inslde the eyebrow. I discovered that when I did a ground up restoration on my 58 Plymouth. I acquired six rust free 58 Plymouth fenders from Western cars. The undercoating just 'ends' at a certain point. A foolish mistake to save a few seconds
of production work and a few pennies for the bean counters.
Ron
Don Verity said it all, but I can add a personal experience. I bought a '57 Plymouth in 1959. The rear anchors did not have boots and they were filled with debris. Did not try to seal them with some sort of boot,
but cleaned out all the debris and kept them clean on a regular basis. Neither ever broke. Had a '60 Plymouth which of course had the boots.
Of course, one headlight brow was rusting shortly after getting the car.. Thoroughly cleaned out all the caked in mud on both fenders and painted the inside of each with Rustoleum primer and then enamel. Kept both
free of debris by blowing out with compressed air regularly. The good one never rusted out. The other required minor repair a couple of times even with the coating inside.
Don Warnaar
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