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      10-13-2010, 06:37 PM   #1
phyek
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Yellowing carbon fiber on roof

Does the carbon fiber roof on the m3 eventually yellow as a result of exposure to sunlight? I've read this is a pretty common problem with exposed carbon fiber on other cars.
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      10-13-2010, 07:18 PM   #2
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Does the carbon fiber roof on the m3 eventually yellow as a result of exposure to sunlight? I've read this is a pretty common problem with exposed carbon fiber on other cars.
It's supposed to be UV protected. Who really knows though, they're not old enough.
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      10-13-2010, 11:19 PM   #3
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I think it will... just give it some time..
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      10-14-2010, 12:13 AM   #4
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Have we seen this happen to the M6's yet? I think if they haven't had any issues, neither should we.
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      10-14-2010, 06:12 AM   #5
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Have we seen this happen to the M6's yet? I think if they haven't had any issues, neither should we.
Shit, I never even knew they had a CF roof! I was thinking you'd have to find a CSL in Europe to get a good idea.
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      10-14-2010, 09:21 AM   #6
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I see a high volume of these cars come through our dealership and I've yet to notice any issues with M3's or M6's...so thats a good sign but we'll see how they look after 10+ years
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      10-14-2010, 05:30 PM   #7
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In case the CF does yellow, is this covered by warranty?
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      10-15-2010, 03:17 AM   #8
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If it does yellow, your warranty will have expired for sometime already.
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      10-15-2010, 01:13 PM   #9
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Quote:
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If it does yellow, your warranty will have expired for sometime already.
this.
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      10-15-2010, 02:57 PM   #10
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Has anyone experienced yellowing on the M6?
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      10-15-2010, 04:35 PM   #11
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I saw a CSL (it had the CF roof and the CSL interior - pretty sure it was a real one) at the Dinan open house. I don't recall that the roof was yellowed (but didn't look real close).
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      10-15-2010, 05:13 PM   #12
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Thanks for the pic but it's tough to tell from those pictures.
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      10-15-2010, 07:59 PM   #13
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you wont have a problem with it getting yellow as long as you polish it when you notice any oxidation, and keep it waxed regularly.
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      10-15-2010, 08:16 PM   #14
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Quote:
Originally Posted by phyek View Post
Thanks for the pic but it's tough to tell from those pictures.
Wasn't trying to show yellowing or not, just validating that I saw a CSL (or a very good clone). You're in the SF Bay Area? You could have gone to the Dinan open house and seen it yourself. I drove up from the south San Joaquin Valley (Visalia) to be there myself. I posted several pictures of the day here: http://www.m3post.com/forums/showthread.php?t=436260 .
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      10-16-2010, 01:58 PM   #15
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Quote:
Originally Posted by calintexas View Post
Wasn't trying to show yellowing or not, just validating that I saw a CSL (or a very good clone). You're in the SF Bay Area? You could have gone to the Dinan open house and seen it yourself. I drove up from the south San Joaquin Valley (Visalia) to be there myself. I posted several pictures of the day here: http://www.m3post.com/forums/showthread.php?t=436260 .
I had no idea the event was going on otherwise I would have attended. Thanks for the link, pix look awesome
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      10-16-2010, 02:13 PM   #16
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Quote:
Originally Posted by calintexas View Post
Wasn't trying to show yellowing or not, just validating that I saw a CSL (or a very good clone). You're in the SF Bay Area? You could have gone to the Dinan open house and seen it yourself. I drove up from the south San Joaquin Valley (Visalia) to be there myself. I posted several pictures of the day here: http://www.m3post.com/forums/showthread.php?t=436260 .

That car belongs to a friend of mine. It is a full CSL conversion with pretty much every dinan parts on it.
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      10-16-2010, 04:31 PM   #17
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Mine's an 08 and I believe it's been outside most of it's life (no garage). No yellowing yet.
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      10-16-2010, 05:56 PM   #18
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Quote:
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That car belongs to a friend of mine. It is a full CSL conversion with pretty much every dinan parts on it.
Thanks. It is a nice car. I thought it might be the real deal as it has all the interior pieces as best I could tell. He must have a ton of money in it.
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      10-18-2010, 12:45 PM   #19
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Waxing will prolong the clear coat but no amount of wax will prevent the discoloration and peeling. It depends on the quality of the UV protectant/clear coat and how often is the car parked outside during the strongest part of the sun-shining days.

My old Evo had a CF spoiler. The clear coat started peeling after 4 years. I parked it outside everyday under no cover. Once the clear coat peels, your CF will discolor.

My suggestion is if the car is parked outside, you should put a cover on it.

The silver lining is this: if it does start to peel, you can sand off the clear coat and reapply it again and it'll be good as new for another 4+ years.
The problem is this isn't a spoiler where you can take it off and do it over a weekend in your garage, you need to have it professionally done. It costs about $250 to do a spoiler, for a roof, my guess is it'll cost close to $900.
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      10-18-2010, 02:33 PM   #20
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IMHO a good coat of wax/sealant regularly applied would prevent clear coat failure on CF parts as it does on regular paint. I don't see why there would be a difference.
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      10-18-2010, 03:46 PM   #21
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^The CF piece on my old car was def. not designed to be exposed to sunlight for 365 days a year for 4 years. I waxed it religiously. What wax/sealent did you have in mind?

Who knows, maybe BMW uses better clear coat/UV protectant? After going through what I did with my spoiler, it would be a lot easier to park the car indoors or at least put a cover on during the day given the large surface area for a CF roof on the E92.

In retrospect, I should have just used an old sheet or towel and cover my spoiler while it was parked outside whenever the car is parked for a long time like when I'm at work, it takes like 2 secs to take it off.
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      10-19-2010, 10:44 AM   #22
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I pretty much just use Optimum Car wax and blackfire now. I think carbon fiber yellowing has a lot to do with the clearcoat. Many carrera gts have yellowing on their cf parts. But clearcoat failure leading to pealing in 4 years is pretty fast, was it a factory spoiler of aftermarket?
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