sec floor pan is it doubled skin and rust - Mercedes-Benz Forum
 
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post #1 of 10 (permalink) Old 04-23-2019, 02:43 PM Thread Starter
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sec floor pan is it doubled skin and rust

i have stripped the floor on my sec literally all running gear front and back, scraped all the rubber underseal, floor was solid as were sills, few small areas of rust which i patched up car is ready for 2k eopxy primer, then raptor and maybe waxoil
The floor was solid like new metal does this mean the inside of the car floor will also be solid or are the inside floor prone to rust
i dont want to finish all the underside and then find the inside of the floor needs weld areas as this will break the continuous run of raptor
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post #2 of 10 (permalink) Old 04-23-2019, 02:57 PM
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Double skinned yep. The top part of the floor is less important than the bottom. At the front of the passenger footwell it's just sealed with seam tape or similar I think.
It can rust there at that joint but that's all I've seen.
Air conditioning drains disintegrate and the condensation waste pools there.

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post #3 of 10 (permalink) Old 04-24-2019, 12:00 PM Thread Starter
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so if the outside floor is solid im assuming the inside should be good
can i spray waxoil into the cavity between the two skins
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post #4 of 10 (permalink) Old 04-24-2019, 01:21 PM
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The problem is thAt often water will enter the cabin , usually from blocked or leaky drains , and get trapped between the two floor layers and rust develops

Not seeing any rust either under the carpet on top of the floor , or under the car , is no insight into the condition between the floor layers

Spraying fluid film or wax oil won’t hurt but likely wont help much either as it’s nearly impossible to get to where water will stand between the layers
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post #5 of 10 (permalink) Old 04-24-2019, 01:34 PM
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Yes the water entering the cabin without you realising, is the potential problem.

You can totally get wax in there, it's easy. But you'd have to be sure it's bone dry.

A little bit rusted on the front of mine and I could get my phone camera just peeping in to take pics. So Dynax wax went in and lots of it.
This cavity can fill with water, it then starts to come out at the front of the footwell. Then it goes along the wiring conduits and you only realise it's happening once the rear footwells become flooded.

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post #6 of 10 (permalink) Old 04-24-2019, 02:29 PM
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Yep I had a Sec and couldn’t figure out why the rear foot wells were flooding , it was a mint condition 70k mile car too .
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post #7 of 10 (permalink) Old 04-24-2019, 03:29 PM Thread Starter
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So really best to put a camera probe between the two layers
Im assuming if there is rust you cant get to it
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post #8 of 10 (permalink) Old 04-24-2019, 03:31 PM Thread Starter
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Where exactly does the water get in from rear feet area was dry front carpet underlay passenger side was very slightly damp
Do i need to take front seats out to access the two layers
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post #9 of 10 (permalink) Old 04-25-2019, 12:41 AM
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No the two layers is effectively in the front footwells only. The top layer is almost superfluous really, apart from its not because the front seats are on it!

I recommend searching for water leak issues, there are various potential entry points. The drains on each side of the shower assembly under that grille :blocked or rusty. Sunroof drains, same.
On mine it took me ages to figure out but underneath the battery area had perforated with rust, the water went inbetween bulkheads and slowly filled up under the floor...

Easiest thing to check is the air conditioning drain hoses. Hopefully it's just that. They disintegrate, you'll see how if you see the pictures somewhere on here.

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post #10 of 10 (permalink) Old 04-25-2019, 02:35 AM Thread Starter
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I will do a search but if you hace any pics of the drain holes sunroof etc that would be great may as well replace new pipe or metal now if i take out front seats is most of the floor exposed
From your explanation 3/4 is single skinned only front is double
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