What sealant?

[Monzta]

I have found what's probably causing the water in my driver's footwell. I seem to be missing a chunk of seal on the underside of the ECU housing.

IMG_20190718_185417990.jpg

I've ordered a good secondhand housing with a complete seal but want to add a bit of further sealing material to prevent future leakage but don't want to use silicon or polyurethane type stuff which is a bit permanent. I'm looking for something that stays soft, maybe a grease of sorts and means I can remove the housing again in future without ruining the rubber seal.

What stuff do you guys recommend?

[calum]

Sikaflex will do the job.

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[Gazwould]

What is that housing complete with seal , new ?

[calum]

What is that housing complete with seal , new ?

5th word on original post is a clue.

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[Gazwould]

'Probably' .

[calum]

'Probably' .

Under the photo

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[Gazwould]

Just wondered how much it was new for the OP to seek secondhand .

After all you wouldn't seek a second hand pollen filter housing with a similar seal for a Passat B5 & 5.5 .

[calum]

Personally I would dump the seal and use Sikaflex, as the name suggests it doesn't fully harden.
Never had a problem with water in the B6, the Passat was terrible.

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[Monzta]

I've bought a good secondhand housing with an undamaged seal. Being that the seal's not brand new I thought maybe a good slathering with silicone grease would give it a better seal and still make it possible to remove again at a future point.

[Monzta]

In the end I used a roll of butyl tape I had in the shed to replace the original rubber seal. So far so good, no sign of water ingress after a good hosing. Plus the butyl should stay soft and pliant for years to come.