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Boot seal upper

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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birdy_z4
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Location: Warwickshire

Boot seal upper

Post by birdy_z4 » Sun Jul 18, 2021 11:55 am

Doing some maintenance

Should the rear upper seal on the boot have gaps as per the pictures

Previous owners have at some point silicone the seal but it has started peeling off
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clarker63
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Boot seal upper

Post by clarker63 » Mon Jul 19, 2021 9:30 am

No, there should be no gaps!

This is a common fault. the seal underneath becomes brittle and water comes through and drips into the boot around the sides. I took off the whole seal and redid it with flexible sealant. it can be very expensive if it drops onto your electrics on the right hand side of the boot.

plenty of issues around this on the forum, for example:

viewtopic.php?f=23&t=125536&hilit=seal
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35is, sadly gone, but not forgotten.

flybobbie
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Boot seal upper

Post by flybobbie » Mon Jul 19, 2021 10:05 am

Underneath is some grey/white non drying mastic on my car. Looks like a bodge job, but probably only material that will stick.
Sure diy can do better, need to use some black drain pipe mastic, not sure if silicone will stay stuck to the plastic, plastics used are oily.

birdy_z4
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Location: Warwickshire

Boot seal upper

Post by birdy_z4 » Tue Jul 20, 2021 10:25 am

Thanks all for the tips and advise. Previous owners looked to of sealed it inside at some point as there is an obvious blobs of some kind of stuff visible

javis20
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Boot seal upper

Post by javis20 » Thu Jul 22, 2021 6:52 pm

What solvent can be used to remove the original gray adhesive?

warmasice
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Boot seal upper

Post by warmasice » Thu Jul 22, 2021 10:43 pm

Try this butyl sealing tape. It's flexible (you can easily flatten it down), sticky and adheres to pretty much anything. Gutter sealant is made from the same stuff.

Just make sure the area is clean and dust-free:

https://www.amazon.co.uk/dp/B08NP4YW4D
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clarker63
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Boot seal upper

Post by clarker63 » Fri Jul 23, 2021 11:33 am

javis20 wrote: Thu Jul 22, 2021 6:52 pm What solvent can be used to remove the original gray adhesive?
mine just cracked off if I remember...

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