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Rear trunk corrosion
- Thread starter milesr3
- Start date
My MSM has a small amount of bubbling there, but I would never have noticed it if not for this thread. I'll keep an eye on it over the next 12 months & get it sorted if it gets any worse. For the time being, I think it's best left alone.
In my case the corrosion is not propagating from the seam. It is on the surface of the underside of the trunk lid between the rubber seal on the rear window and the rubber seal around the trunk aperture.
IMO it looks like the holes in the rear window seal, designed to avoid water entering the trunk when opened, are allowing water into the void around the trunk aperture which is then not draining. This is creating a constantly humid environment which has permeated the paint.
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fholbert
Active Member
Curious, do you clean your car with Simple Green? I ask because Simple Green is not good for aluminum. They do make an aluminum version, mainly for aircraft, but it’s not well known.
The boot/trunk lid on the M3 is made from Steel, not Aluminium.
I doubt it would be Pure Green."Green" .... Is that the stuff that that simpleton in Blackadder made?
Greytop
Member
Possibly but my theory is that it's moisture hanging around in that area (front lip of boot lid) courtesy of the rubberised drip tray with the holes in it. The holes are not actually large enough for the water drain away fully in some areas. This means water is just sat that there in a trough up against that area of the underside of the boot most nights (if it's cold or damp/wet) and some of the day too. If the boot hasn't been prepared properly prior to the paint being applied and also the priming and painting process it's self is of a questionable standard then..... bingo.
In addition I don't think the bubbling I'm now seeing post warranty work is necessarily the same as the first issue. I think the warranty work is just a shoddy job by the paint shop that Tesla Reading farmed my boot lid out to.
Perhaps related to the stories I've heard of people reporting water sloshing around in their actual boot lid? When I've opened my boot I can see water droplets coming off the "points" at either end, but I've always assumed (and hoped) it's just water beading off the boot lid to this point.
MrBadger
Badger out
When we initially reported the car misting up, often whilst supercharging (turns out it was poorly fitted roof glass that matched my FLIR photo evidence), Tesla immediately checked for water within the boot edge fold - done in front of me which opened up the conversation about it being a not uncommon occurrence.
Greytop
Member
Good to hear you're happy with the repair.
Mine came back from Reading Tesla yesterday having been 'reworked', it looks like they have done also done a good job this time but time will tell.
ForTheHalibut
Member
I replied to you on another post of mine about the same topic.
And coincidentally I seem to be having the same issue as you... area was repainted and now 6 months later its bubbling again. Hoping it doesn't happen a 3rd time.
Greytop
Member
Likewise I've just replied in your thread.
I hope you get it sorted out to your satisfaction which to my mind (given the reoccurrence regularity) should be a new trunk lid.
Billbrown1982
TM3 LR 2021 | Red | FSD
I'm sure i'm being thick but I can't for the life of me work out what part of the boot those photos are actually of. This thread has come up a few times and I keep trying again and/or meaning to ask so I can go and check mine 
ForTheHalibut
Member
Does this pic help? In my case it mainly occurred above the trunk button.I'm sure i'm being thick but I can't for the life of me work out what part of the boot those photos are actually of. This thread has come up a few times and I keep trying again and/or meaning to ask so I can go and check mine
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Not wanting to worry anyone but for a 2019 car, this thread highlights a bit of background: Its rained and notice (heard) water in the boot lid?
Could be a bad paint job. Could be rusting from the inside out.
Could be a bad paint job. Could be rusting from the inside out.
Underside the front, where it meets the rear window.
Greytop
Member
Also for me the underside the front, where it meets the rear window.I'm sure i'm being thick but I can't for the life of me work out what part of the boot those photos are actually of. This thread has come up a few times and I keep trying again and/or meaning to ask so I can go and check mine
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