Longitudinal Rust - Water Egress Options

[RTz]

Good morning gentleman, first time poster from the wet state of Oregon. I picked up a nice '72 from Mikey914 a couple months ago. I've found virtually no rust so far and obviously I'd like to keep it that way.

My question, regarding the long's, is where are the places water can/does get into them? I get the hell hole opens up the top and water has a direct path, but without the hell hole, what other ways does water make its way in?

Thank you,
Ron

[SirAndy]

The rear window tends to leak and water will puddle on the floor behind the seats and when the pan starts rusting around the perimeter it will allow water to get into the longs that way.

Remove the seats, remove the carpet on the floors, do the "crunch" test on the tar.
If you see any rust around the edges, dig deeper.
Reseal the rear window.

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