We stripped out the interior of a '68 Dart two door this week and found a strip of surface rust on the passenger side of the package tray and serious rust (holes) in the trunk floor and spare tire well. Otherwise the floor was in good condition (west coast car). What I'm wondering is whether the rust came from a poor rear window seal... is that a common problem in '68 Dart two-doors? Does it justify a new gasket and re-sealing? Just curious if others have seen similar issue. Thanks,
Bill

I don't know so much about your car, but if the rear seal has been leaking, it's possible that the steel lip has also rusted through.

If you do go through the trouble of removing the rear seal, it might be worth getting the metal work cut n welded (I'm a Brit used to considerably more rain and rust though, so it might not be so bad on your machine).

I did this job on my '60 and it wasn't too bad (novice welder, novice metal worker). I cut the laminated steel lip out (6" length at a time) and replaced it with a piece of extra thickness. I then seam welded this top and bottom to ensure strength.

Afterwards, the damn thing still leaked! But I got it sealed with a British product called (don't laugh) Captain Tolley's Creeping Crack Cure. This isn't a mastic/bathroom seam sealing type thing, its a thin fluid that creeps into spaces using capilliary action and sets. Takes five or six applications but there's no leak at all now. Maybe somthing like that would be worth a go before you start pulling things apart? Make sure you don't let it build up at the bottom of the window (or inside on your upholsery) because it's a sod to remove afterwards.

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1960 Plymouth Belvedere 4 door sedan
Stock 60 225
Push button 3 speed Torqueflite
Right Hooker

Yes.
It is a common problem in A-bodies of whatever year and whatever door count (except station wagons, obviously).
Yes. With bedding and glazing compound, and installed by someone who knows and cares what he's doing.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

OK, that's what I suspected. Thanks for confirming! Since this car will go with my daughter to Seattle it makes sense to get it sealed right the first time. Thanks guys!

Perhaps I will see her car when I'm in Seattle! She going to school, or?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

The design of the rear window channel or "socket", tends to hold any water that gets past the gasket / sealer compound.

In cars that have rust holes in the rear window "V" channel, (usually in the lower, outer corners) we install water "drain tubes", pointing down into the trunk, when doing the rust-out metal repair.

A piece of rubber hose can be installed onto the tubes and routed into the lower fender well or out thru a plastic plug in the trunk floor.
Water that gets into the channel is therefore drained away so the area drys-out fast, once it stops rainning.

The only downside we have seen, (beside the extra work to install the drain tubes) is that dirt can clog-up the entry point so the drain tubes needs to be cleaned on occasion.
DD