BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Wash, Wax, Detail, Cosmetic Maintenance & Repairs
 
Mporium BMW
Post Reply
 
Thread Tools Search this Thread
      07-26-2017, 11:25 PM   #1
E92friendly
Private First Class
United_States
44
Rep
136
Posts

Drives: E9x m3 sexiness
Join Date: Mar 2017
Location: Bay area

iTrader: (2)

Carbon Fiber Roof Saved! dreadful gel-coat fix

I AM HERE TO HELP WITH ANY QUESTIONS FOR THOSE IN CONSIDERATION OF THEIR OWN EFFORTS!


So I myself have done countless hours of research trying to figure out who else saved their carbon fiber roof from the peeling gel-coat. The most i found was one guy with an M6 made a video talking about his roof and ended up painting it the same color as the car. Well folks, that does not satisfy me. I purchased the car for the car and its performance and aesthetics. Painting over the looks of the carbon the same color of the car would be nothing but an utter disappointment. So here I am now writing up on this experience and hoping i give a deep insight on my experience on recovering the roof without sacrifice. I am also conducting this write up to help give people the relief that they to can also salvage their roof from the horrifying gel-coat that becomes weaker over time from outside sittings. Not only have i taken plenty of pictures but i also made some video footage of my process for them DIY guys. I want to make this write up simple and fast because no one wants to read forever. haha.




Lets begin



remove the antenna cover, it is double back taped so you can get some sort of strong thin plastic to removed it cutting through the tape. once removed, use a T25 or T30 torque socket and pop the antenna off. I suggest taking a picture of the wiring plugs to ensure its plugged back into the same slots.

Peel from the beginning center of the roof

Work your way around until entire center is peeled

in my experience the 4 corners begin to become a challenge. that is because the roof is a dome shape which the sun beats directly in the center.

any hard areas to work i used a brand new clean razor blade.

you cannot cut directly with the blade you must take your time and do a teeter-totter motion to slice through the gel-coat. be sure to keep the blade in a very sharp angle to prevent slicing into the roof. it may happen that's okay just cannot cut so deep more than likely you will not see it after re-cleared.

where the antenna is located try your best to remove as much clear as possible but keep in mind the antenna will cover the area so it is okay if there is a hard line inside within the cover itself no one nor you, will see it.

as for the edges, use the blade in a sharp angle to carefully cut through the clear, it was relatively easy for me cut down as much as possible, keep in mind also here the roof moldings will hide any hard lines in there too.

it is an option for the enthusiast to have both front and back glass removed for painting but is not needed. they can pull back the strip and mask off the seal.

mask off the hole where your antenna was with good tape and rinse down your roof cleaning it up as well as you can with water, also enjoy it with water on your roof as it simulates clear coat looking clean.

The next morning i drove to my shop where i work and parked my car inside the other building till my lunch break and dropped the car off at my buddies shop down the way for him to do the job.

5-7 coats of clear is recommended, every 2 coats sanding is recommended. the final coat you will still see the weave pattern in the clear coat as it settles in. my buddy did 7 coats as he told me. i left it alone at that if i want to i could sand it down and buff polish to give it a flat final finish. but the weave pattern in the coat does not bother me i dont really notice unless i take a good look at it.

As safety reasons i highly suggest gloves and a respirator at most to avoid inhaling and getting all the resin all over your hands. do at your own risk.
Attached Images
        

Last edited by E92friendly; 07-29-2017 at 11:13 PM..
Appreciate 7
      07-27-2017, 12:42 AM   #2
0-60Motorsports
Colonel
0-60Motorsports's Avatar
Bahrain
519
Rep
2,804
Posts

Drives: BMW M3 JB 04 Coupe
Join Date: Aug 2007
Location: Kingdom of Bahrain

iTrader: (1)

Excellent work on rescuing the CF roof.
__________________
Current Mods:
2004 E46 M3cs JB/CSL
2010 E70 X5M AW/BLACK
2011 VW Golf R DSG White/Black
IG: @060Motorsports
Appreciate 0
      07-27-2017, 06:38 AM   #3
Blindside_137
Major General
Blindside_137's Avatar
United_States
2932
Rep
9,583
Posts

Drives: 2011.75 SSII E90 M3 ZCP
Join Date: Jun 2010
Location: Raleigh, NC

iTrader: (2)

Very nice. Looks brand new.

Should be very helpful for others. I know I have seen at least one post or two about guys who had their carbon roof start to fade or peel.
Appreciate 0
      07-27-2017, 07:09 AM   #4
///M Power-Belgium
Lieutenant General
///M Power-Belgium's Avatar
Belgium
21623
Rep
12,606
Posts

Drives: ///M3-E92-DCT Silverstone II
Join Date: Jul 2012
Location: Belgium

iTrader: (0)

Good job , CF roof looks really good !

Think I saw a dent in your car ?
Attached Images
 
__________________
BPM DEV-Tune & DCT Software-Tune & Servotronic & coding ///Alpine HID Angeleyes ///Oem.exhaust mod.
Appreciate 0
      07-27-2017, 08:07 AM   #5
E92friendly
Private First Class
United_States
44
Rep
136
Posts

Drives: E9x m3 sexiness
Join Date: Mar 2017
Location: Bay area

iTrader: (2)

Quote:
Originally Posted by ///M Power-Belgium View Post
Good job , CF roof looks really good !

Think I saw a dent in your car ?
Haha! Yes thanks for pointing that out the first owner put a bike rack on the car. It's okay i will repair that to on a later day the hood also has a ding.
Appreciate 1
      07-27-2017, 09:47 AM   #6
vincE92M3
Major
vincE92M3's Avatar
United_States
527
Rep
1,370
Posts

Drives: ///M
Join Date: Nov 2012
Location: Atlanta, GA

iTrader: (3)

Garage List
'11 E92 M3  [0.00]
Nice work!
__________________
Appreciate 0
      07-27-2017, 09:56 AM   #7
deansbimmer
BimmerPost Supporting Vendor
deansbimmer's Avatar
United_States
2724
Rep
2,699
Posts


Drives: 2011 E93 M3
Join Date: Nov 2014
Location: DFW, Texas

iTrader: (17)

Garage List
1988 BMW M3  [0.00]
2013 BMW M3  [0.00]
2011 X5M  [0.00]
2011 BMW M3  [0.00]
Great work!

Most will recommend painting the roof body color because removing the clear from bare carbon is very difficult. It is very easy to use a sander and go past the clear and into the weave which will ruin the weave's visual effect. Clever of you to use a razor to shave off the 'dead' clear. Sounds like the conditions were just right to allow it. Most shops wouldn't hassle with that method.

Appreciate 1
12M37.50

      07-27-2017, 10:04 AM   #8
E92friendly
Private First Class
United_States
44
Rep
136
Posts

Drives: E9x m3 sexiness
Join Date: Mar 2017
Location: Bay area

iTrader: (2)

Quote:
Originally Posted by deansbimmer View Post
Great work!

Most will recommend painting the roof body color because removing the clear from bare carbon is very difficult. It is very easy to use a sander and go past the clear and into the weave which will ruin the weave's visual effect. Clever of you to use a razor to shave off the 'dead' clear. Sounds like the conditions were just right to allow it. Most shops wouldn't hassle with that method.

Well hopefully I did not miss lead anyone because I only used the razor blade for the edges and the four corner areas of the roof but mostly 90% from the center and out words easily peeled off with a thin hard plastic scraper a used from work also keep in mind I am an autobody technician so I was confidently able to do this project. But I feel that anyone can do this since no true bodywork is needed other than time and effort and patience to peel off the existing gelcoat
Appreciate 0
      07-27-2017, 10:31 PM   #9
vincE92M3
Major
vincE92M3's Avatar
United_States
527
Rep
1,370
Posts

Drives: ///M
Join Date: Nov 2012
Location: Atlanta, GA

iTrader: (3)

Garage List
'11 E92 M3  [0.00]
Was your car parked outdoors in the sun for most its life?
__________________
Appreciate 0
      07-28-2017, 12:24 AM   #10
E92friendly
Private First Class
United_States
44
Rep
136
Posts

Drives: E9x m3 sexiness
Join Date: Mar 2017
Location: Bay area

iTrader: (2)

Quote:
Originally Posted by vincE92M3 View Post
Was your car parked outdoors in the sun for most its life?
Yes that is why It happened.
Appreciate 0
      07-28-2017, 01:13 PM   #11
JRob23
Captain
United_States
50
Rep
650
Posts

Drives: e92 m3
Join Date: Feb 2012
Location: New Jersey

iTrader: (3)

Looks good. I'm curious if that dent would be difficult to pull/pop given its position on the car.
Appreciate 0
      07-28-2017, 01:50 PM   #12
E92friendly
Private First Class
United_States
44
Rep
136
Posts

Drives: E9x m3 sexiness
Join Date: Mar 2017
Location: Bay area

iTrader: (2)

Quote:
Originally Posted by JRob23 View Post
Looks good. I'm curious if that dent would be difficult to pull/pop given its position on the car.
As a body tech yes I can pop most of it out with a dent puller, however I will still need to fill the little bit left in with putty or glaze and block it smooth.
Appreciate 0
      07-31-2017, 12:08 AM   #13
6ixSpd
Save the manuals!
6ixSpd's Avatar
Canada
5353
Rep
6,365
Posts

Drives: '12 M3 6MT
Join Date: Feb 2016
Location: 416

iTrader: (4)

Great work salvaging your roof! Always good to see people trying new ways to fix these issues.
__________________
'12 M3 6MT Alpine White + Fox Red Extended

@tailor.mad3
Appreciate 0
      07-31-2017, 11:02 AM   #14
E92friendly
Private First Class
United_States
44
Rep
136
Posts

Drives: E9x m3 sexiness
Join Date: Mar 2017
Location: Bay area

iTrader: (2)

Quote:
Originally Posted by 6ixSpd View Post
Great work salvaging your roof! Always good to see people trying new ways to fix these issues.
I had also posted a thread of a repair salvaged front carbon lip as well.
Appreciate 0
      08-23-2018, 01:37 PM   #15
M3MPH1S
Captain
M3MPH1S's Avatar
United_States
546
Rep
770
Posts

Drives: 2010 E92 M3
Join Date: Mar 2015
Location: Atlanta

iTrader: (8)

So once you peeled off the damaged layer did you sand the bottom most exposed layer before you started painting? Or was it already sufficiently clear?
Appreciate 0
      08-25-2018, 09:55 AM   #16
Dr. Dre
the doctor
United_States
263
Rep
435
Posts

Drives: E46 M3 Alpine White
Join Date: Dec 2008
Location: CA, Bay Area

iTrader: (0)

I use to work for Mitsubishi Motors NA. The carbon fiber rear wing coating would start to fade and peel. One of the body shops in San Jose was able to fix them. The guy would use a razor blade and strip it by hand (amazing) and refinish it. They looked pretty much factory.

It was so good that we sent finished samples back to Japan.
Appreciate 0
      12-31-2018, 06:05 PM   #17
Crash n burn3
Registered
0
Rep
4
Posts

Drives: 2008 M3
Join Date: Nov 2018
Location: Alabama

iTrader: (0)

Where are your videos?
Appreciate 0
      12-31-2018, 09:24 PM   #18
SoManyBlueCars
Major
SoManyBlueCars's Avatar
United_States
1717
Rep
1,431
Posts

Drives: 2015 335i xDrive
Join Date: Apr 2015
Location: New Jersey

iTrader: (0)

Could you wet sand it instead of taking a razor to it?
__________________
2011 E92 M3 - Interlagos Blue - Sold
2014 F30 328i xDrive - Estoril Blue - Retired
2015 F30 335i xDrive, MPPK - Glacier Silver

@MachinesWithSouls
Appreciate 0
      12-31-2018, 09:38 PM   #19
m3jala
Captain
513
Rep
747
Posts

Drives: Jet Black 2013 BMW M3
Join Date: Jan 2018
Location: Tysons Corner, VA

iTrader: (0)

Awesome
Appreciate 0
      01-07-2019, 04:16 PM   #20
MikePe92
New Member
6
Rep
9
Posts

Drives: 2011 e92 M3 Coupe
Join Date: Jan 2019
Location: Orange County, CA

iTrader: (0)

Hi all, new to the forum. I have a 2011 M3 Coupe with the CF roof and just started having the same issue. I had a small chip and moisture got underneath the clear so now there's a bubble about 3 inches in diameter.
Can anyone recommend a body/paint shop in the Los Angeles/Orange County area that can do this repair?

The body shop I use for some of my other cars has never done this with carbon fiber and said that his guys would normally sand down the spot, feather it out and respray the clear coat.

Thanks, Mike
Appreciate 0
      01-07-2019, 04:26 PM   #21
BayE30
Lieutenant Colonel
United_States
1267
Rep
1,881
Posts

Drives: 2011.75 E90 M3 ZCP
Join Date: Jul 2014
Location: San Francisco

iTrader: (5)

5-7 coats of clear with sanding in between would cost a fortune for the consumer. almost better value to replace with a new roof... for insiders it makes sense, but otherwise probably not.
__________________
I am never able to post pictures on forums, all my pics are on IG @baye30 https://www.instagram.com/baye30/
Current Garage - [2011 E90 M3 ZCP] [2005 E53 X5 3.0 Sport] [1988 E30 325IS 24V]
Appreciate 0
      01-07-2019, 07:30 PM   #22
MikePe92
New Member
6
Rep
9
Posts

Drives: 2011 e92 M3 Coupe
Join Date: Jan 2019
Location: Orange County, CA

iTrader: (0)

I'm in the auto industry so I can get insider rates. The issue I'm running into is that a lot of the shops that I use haven't done anything like this (and generally don't work on CF). Is this process something that any competent body shop should be able to do if I show them this link?
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 02:19 PM.




m3post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST